How to run a computer without a system unit

Starting the power supply without an atx computer: jumper, shorting the wires and other ways

If your computer suddenly stops responding to the power button, the first place to start looking for the cause is the power supply.

So, the first thing to do is to turn off and completely de-energize your computer by pulling the plug out of the socket.

Next, unscrew the side wall of the computer and most often in the left upper part we observe the power supply unit.

The location of the power supply in the computer

computer, system, unit

To check it and for your convenience, you can unscrew it and put on the table, but you can not do this. Everything we need to run it without a motherboard is easily available.

Now you need to disconnect the two connectors from the motherboard. The first is a 24 or 20 pin connector.

The second connector is a 4 or 8 pin connector which supplies power to the processor.

It is also better to unplug the power connectors of hard drives and if you have auxiliary power for the video card.

The important thing is ! If you have a disk drive, you don’t need to power it down. It is highly discouraged to plug in the power supply with no load. If you do not have a floppy drive, then you should leave the hard drive power connector.

Now take the 20 (24) pin connector from the power supply, turning it with the latch side facing up.

Next, count off to the left the 4th wire in the first row. It is most often green in color. To start the power supply we will need to connect it to any of the neighboring black wires.

Once the wire is found, we take an ordinary paper clip and bend it into an arc or a piece of wire with the ends stripped of insulation.

Important! Before the next action, the power cord going from the socket to the unit must still be disconnected from the PSU.

Connect pin 4 to the black adjacent pin 6 of the. You get something like this:

Connection 4 and 6.Connect the power supply’s 20-pin connector

If your power supply has a power button on the back near the connector for the wire, then it should be in the off position (position 0).

Now all that remains is to insert the power cord into the PSU and turn on the button. If the fan on the PSU is spinning, it means that the PSU has started, otherwise the PSU may be considered faulty and the main culprit for the lack of response to the power-on button of the computer.

Starting up a PSU without a motherboard does not always mean that the PSU is in working order. Since in this case the load on it is small. 1 hard drive or disk drive does not provide even an approximation of the load that a power supply unit experiences when the computer is turned on. It is possible that with a small load the PSU starts, but with a more serious load it does not.

How to turn on a power supply without a computer

Hi all. I hope that all of you are well aware of the fact that in the computer system unit lurks such an interesting and useful thing as a power supply. And for us. craftsmen, power supplies are of particular value. Surely many of them are lying around. It happens sometimes. you bought a new computer but the parts from the old one are gathering dust in the closet. Let’s try to find a way to use them.

An ATX standard power supply can supply the following voltages: 5V, 12V and 3.3V. Besides they have pretty good power (250, 300, 350 W etc.). But here is the problem. How to start it without a motherboard? That’s what we will consider in today’s article. Older power supplies, standard AT run directly. You can not run an ATX standard power supply this way. But it doesn’t matter anyway. To turn the PSU on we only need to have one small wire which connects two pins of the plug.

But first I want to warn you. unplug all the wires from the motherboard, screws and drives, in case you are smart enough to run the power supply directly in the system.

Here we go. To begin with we take our unit out of the system box.

One more warning. No need to run your unit idle. So you shorten his life. You have to load it up. You can connect a fan or an old hard drive to the power supply for this purpose.

As a matter of fact you have to connect PS_ON to zero to start the power supply. In most cases these are green and black pins on the plug, but sometimes there are color blinders among the crafty Chinese who get confused with the color coding. So I recommend to study the pinout first. It is shown in the following picture. On the left is the new standard 24 pin plug and on the right is the older 20 pin plug.

In my case an older standard (20 pins) will be shown. I have the color coding intact.

To start it up, I made a jumper like this.

This is how we short-circuit our contacts.

If you plan to use the power supply all the time, you can make a button like this for convenience.

Start the PC without the power button using the mouse or keyboard

Almost no one probably knows that you can start the computer directly from the keyboard (without the “Power” key on it) or the computer mouse. To do that, go into the BIOS by pressing and holding down the appropriate button, which depends on the version of the BIOS. Usually it’s the DEL key.

  • In the window that opens we need the “Power Management Setup” section.
  • Now find the item “Power on by PS2” where you need to specify how to start the computer.
  • To select a specific key to power your computer, find the “Any key” option.
  • Next, in order to save the settings you have set, press F10 and confirm exit with settings saved.
  • Now you can test the specified key on the keyboard.

This way to turn on your computer without the power button seems to be very convenient. To prevent the computer from turning on accidentally, for example if there are small children in the house who climb everywhere, you can set several keys to turn on. In this case instead of “Any key” find “Hot key” then at the bottom of the monitor you will see “Ctrl-F1”. Click on it and you can set your keys to power on your computer.

To make the computer turn on by pressing one of the buttons on the mouse, go into “Power on by mouse” and click on the right or left button to set it to power on.

How to reset the BIOS using a removable battery

The BIOS settings are retained even when the computer is not connected to a power source. This is due to the battery on the motherboard, which keeps the chip permanently powered. But if you take it out for a few minutes, the BIOS is reset.

Turn off your computer and unplug it from the power outlet and other devices. If you have a laptop, get the battery.

Remove the case cover and locate the battery on the motherboard. Then gently remove the battery for about 10 minutes and reinsert it. Do not overdo it: in some devices it may not be removable. In such cases, you have to rely only on the previous methods or give the machine for resetting to the service center.

On many laptops the battery is connected to the motherboard with a special cord. If you notice one, disconnect the wire from the board before removing the battery.

After reinstalling it, close the case, reinsert the battery if necessary, and turn on the computer.

Continue to explore the computer. In today’s lesson we’ll look at how to turn on, shut down and restart your computer.

How to power on your computer

To turn the computer on you need to press the button on the front of the system unit. Because of the different design of the chassis of the system unit, the button can be in different places and have different shapes. This is usually the largest round button. There is also a small button on the system box which is sometimes very hard to see. This is the reboot button. Some modern system units may not have a reset button.

So, you found the power button on the computer system unit and pressed it. At this point the indicator lights turn on and the computer may start to make a little noise. Do not be alarmed, it is the fans which cool the system unit components have started their work.

After a few seconds you may hear one short beep (squeak) from the system box (not all computers make a squeak). It means that there are no errors in the system unit components. If you hear the beeps more than 1 time, it means that there is something wrong with your computer.

Depending on the computer power its startup can last from 30 seconds to 2-3 minutes. At this moment the screen will change screensaver and pictures.

After the system boots, the desktop appears on the screen. We will look at it in detail in the next lesson.

How to Turn Off a Computer

Turn off your computer the right way. Do not turn off the computer with the power button, otherwise you might lose important information and damage the computer. You might turn off your computer by holding in the power key for a few seconds or by unplugging it from the wall outlet. Only shut down your computer this way in an emergency.

We will use the computer mouse to shut down the computer, and do most of the shutting down. Put your palm on it and move it slightly across the desk in different directions. The cursor on the screen will start to move, just like the mouse. You use the mouse to control the cursor. There are 2 buttons on the standard mouse: right (PKM) and left (LKM) as well as the scroll wheel.

Now move the cursor to the bottom left hand corner of the screen. Tap the Windows icon. The start menu will appear. Now move the cursor to the bottom right corner of this menu. There you will see “Shut down”. In order to shut down your computer you will need to click once with the left mouse button (LKM). Try to turn the computer off and then turn it on by yourself.

How to restart the computer

Sometimes to install a program and when a computer starts to lag you need to reboot it. To do this, repeat all the same steps as for shutting down, but do not press the “shutdown” button. There is a triangle next to it. Hover the mouse cursor over it and the menu will open. There you can click on “Restart” and it will restart. Basically, rebooting is the process of turning off and turning on the computer, going in a row. Only the user does not need to press the power button again.

You can also restart your computer with a small button on your computer. That reboot button. But on some system units it can be absent.

In this lesson we learned how to properly turn on, turn off and restart the computer.

In the next lesson we will look at how to work with the computer mouse and keyboard.

All users are faced with the fact that the computer is rebooting Windows, caused by one reason or another. This can be a planned process to make changes to your computer software or a way to solve problems caused by system crashes and failures.

In the first case, you need to reboot after updating the Windows operating system or an installed program. This is necessary to apply changes to the computer software.

Many users have faced situations when the computer freezes, the mouse or touchpad do not respond, the system has stopped responding to user actions.

As a result, the device is impossible to use, and attempts to get out of this situation have not been successful. What to do?

Forced reboot of the computer will help to solve the problem of an unresponsive OS. There are several ways to reboot, in which all processes are completely shut down, and the Windows operating system resumes its work after the reset.

Start the laptop without the power button through the motherboard

Setting the login through the BIOS is convenient, but to use this method you must first find the hardware button to enter the Boot Menu. And it is not on every model, so you have to disassemble the laptop (Lenovo, Asus, Samsung or any other) and start the laptop with the motherboard.

All work requires extreme care and we do it this way:

  • we de-energize the laptop, pull the plug out of the socket;
  • Remove the battery from the socket;
  • removing the bottom panel of the case;
  • Examine the laptop’s sole, unscrew the screws or use a sharp knife to loosen the clips;
  • find the motherboard and the contact block on it (on the surface will be written jfp1 or f-panel);
  • Look at the pwr sf/ or pwr pin labels;
  • short out the pins with the socket and reassemble the laptop.

On the side panel on the left. The key is recessed, a thin pin comes in handy. One press will be quite enough.

At this point the work is done, but for a beginner who is unfamiliar with the device of the laptop, they can be difficult. It is easier to short-circuit the contacts on the non-working button, we do it this way:

  • Remove panel under the keyboard. If there is no panel remove the whole keyboard. We start disassembly from the top, by successively pressing the latches with a sharp screwdriver or a knife.
  • Lift the corners, then carefully remove the entire panel. Locate the boards with contacts underneath it. They are easy to see by tracing the direction of the stubs.
  • Check if the cable is working. First disconnect it, then close the pins. If the flat cable is damaged, it will have to be replaced, but in the meantime close the contacts with a screwdriver or a knife.
  • Remove the button and bring the short-circuit terminals up (outside). It is more convenient to do with thin wires or cables from an old PC, laptop.
  • Assembling the laptop. Carefully install the keyboard. finished.

Now instead of the on/off button the user has contacts which, when closed, can easily start the laptop.

All variants can save in a difficult situation, when the power button is out or stuck. But it is better not to apply the described methods in a permanent mode, and to take the device to the service center.

Lesson #12. Buttons on the system unit

Usually on the front of the system unit is a power button, as well as a reset button (not all cases have it). Sometimes the buttons are labeled: the power button is Power, the reset button is Reset.

The reset button is usually very small and designed in a way to prevent accidental pressing. This button is used only when the computer stops responding to user actions completely. they say that the computer “hangs.

I do not recommend overloading the computer during normal operation. This can lead to malfunctions in programs and operating system.

Usually the computer is turned off with the help of certain commands in the operating system (through the Start menu), but modern PC cases are able to shut down the computer correctly, even with a single touch of the Power button. In this case everything is the same as in the case of program shutdown, i.e. shutting down the computer by means of the operating system.

If you for some reason need to turn off the power while the computer is running without shutting down the running programs correctly, you can also use the Power button on the case of the system unit. To do this, it is necessary to press it for a few seconds.

Besides the buttons, on the front panel of the system unit there are often LEDs (light bulbs) indicating the switching on of the power and the work of the hard disk.

So after you turn on your computer the power LED is on all the time, but the hard drive LED is blinking, so it only lights up when a running program or the operating system is accessing the hard drive.

How to Check a Power Supply Without Connecting the Load. Answers to Questions

A computer power supply turns on by giving a low logic level (roughly speaking, 0 volts) to its PS_ON input, it turns off by giving a high logic level to the same input (roughly speaking, 5 volts or leave it free).

So, just connect PS_ON (pin 14 on 20-pin connector or pin 16 on 24-pin connector) to any common (GTD). for example, the one next to it in the same row.

The color of the wires. in the ATX standard the PS_ON signal must have a green wire, the common wire is black.So, if the colors are standard, you must short the green wire to any of the black ones.

The power supply can be judged by the rotation of its fan.

But if the power supply unit has a scheme for automatically adjusting the fan speed depending on the temperature of the internal components, there can be a case when such a scheme does not turn on the fan immediately, but only when the components reach a certain temperature.

In that case you can determine whether the unit is turned on by the appearance of output voltages.For example, you can connect to the unit an incandescent lamp at 12 volts.

In practice, in the simplest case the PSU is tested with no load, with the help of an electronic meter, oscilloscope and analysis of the circuit or the board itself.For more accurate testing special test stands are used.

First. on some units the colors of the wires are non-standard. In this case you should be guided by the pin numbers.

Secondly. heavy-duty PSUs may not start without a load, so when you check them this way the unit is likely to turn on for a split second and then turn off immediately. the protection against oversaturation of the magnetic circuit of the power transformer is triggered.

To turn on such a unit, you should provide it with a minimum load. for example, connect a few hard drives or light bulbs.

If there is a limit on the minimum power load a unit may have a mention on its sticker. in addition to the maximum currents on the outputs, which are usually written there will be written and the minimum.

Computer assembly

Article on how to assemble and prepare your own computer to work. From this article you will learn what components are essential for the PC, as well as where to connect them. In addition, we will consider all the main connectors on the back of the system unit and tell you what each of them is for.

Sooner or later every PC user needs to open the system unit (that metal box that buzzes under your desk ;)). Some at the mere thought of it gets scared and they simply call the wizard. Others, on the contrary, are interested in digging into the “guts” of their computer and often this interest still ends up in calling a specialist:)

But there is a third kind of people. These “shrewd” comrades immediately get on the Internet (or even read the instructions). ), find out how everything works and only then will open the system unit and independently make, for example, replacement of RAM or connect another hard drive :). If you’re reading this article, you can give yourself a virtual plus sign. you’re one of the few people who immediately think and then do something 🙂

The essence of the matter

So, in this article we will talk about how to assemble the computer correctly. But the question is why? Well, at least here:

  • You want to buy a new PC and save money (assembled system units are usually 20-30% more expensive than the same components purchased separately);
  • You need to connect new parts (memory, video card, hard drive, etc.п.);
  • You need to have your computer repaired.
computer, system, unit

There are even more options (like changing BIOS battery, CMOS reset, cleaning the computer from dust and so on).п.). The bottom line is that one way or another, and the case will have to open. You don’t want to do that unless your PC is still under warranty and you don’t want to lose it. In all other cases you can do with your “system” whatever you want. And here’s how to do it, respecting the famous Hippocratic Oath (“Do no harm!”), and we’ll talk further.

And what’s under the lid?? 😉

Let’s start our operation by disconnecting all wires from the back of the system unit (if you are working with an already running PC). Your “system box” should be completely free of any cables so you can easily get it out from under the table to the light of day 🙂

The next step is to open it. Usually it is enough to unscrew a couple of screws which hold the right (when looking at the system unit from behind) side wall. Here you should arm yourself with a standard Phillips screwdriver, but there are also the blocks, which have a tricky system of screwless fixation. there you will have to act according to the situation :). We slide aside the unscrewed wall and see approximately the following picture:

A lot of wires, incomprehensible chips and devices for the first time can be confusing. But, enough to get to the heart of the matter and everything falls into place 🙂 To begin with I propose to deal with what without which the computer can not fully work:

To this list we can add a number of devices. For example, if your motherboard doesn’t have an integrated video card (or it’s failed), you’ll need to insert a video card into the corresponding slot. A, if there is no jack for the RJ-45 connector, you must also take care of installing the network card.

The rest of the accessories are optional. If you want you can plug in an old floppy disk drive, or if you want you can replace it with an all-in-one superfashioned card reader for all memory cards. Equip your PC with a disk drive or install on its front panel a bunch of luminous indicators that show processor temperature/cooler rotation speed/time and date/weather on Mars/ latest news in county town N (underline as appropriate :))).

The first word is “mother”

If you go back to the list of required components, the first item on the list is the motherboard. It’s not the money your mother pays for your university tuition or mortgage loan :). This is the main chip (I would even say “macro chip” if you look at its size) which will determine the full potential of your future (or already purchased) PC.

When choosing a motherboard you should pay attention to the following main nuances:

    Form Factor. Roughly speaking, this is the size of our motherboard. Nowadays, models in ATX and micro-ATX form factors are most commonly available. First are very big motherboards with full-sized connectors suitable for building high-performance gaming computers. micro-ATX boards are most often found in so-called “office” PC. They are smaller and can accommodate fewer connectors and outputs. But unlike ATX boards, they do not require additional cooling, due to what computers based on them are less noisy.
computer, system, unit

Depending on the form factor, you will also need to select a computer case. Ideally, it should provide room for the motherboard and have enough space for a power supply (may be included) and additional devices (hard disks, disk drives, etc.).п.). That said, there should still be room inside for free air to circulate out the excess heat generated through the vents on the back (and possibly on the sides and top);

Fortunately, all modern motherboards are equipped with additional slots PCI-Express (outdated version. AGP), in which you can insert an additional graphics card. Here you should pay attention to the number of such connectors and the possibility of them (if they are more than one piece) to work in pairs. Since there are two leading video card manufacturers today, there are two technologies that are used to make this possible. For video gas pedals from nVidia it’s tagged SLI and for ATI it’s CrossFire;

In fact, there are much more nuances in each of the points, but we can not discuss them all in this article. Therefore, I give you only the basic guidelines that will help to significantly narrow your search, but without the search for the optimal configuration / price ratio you can not do without it 🙂

Well, now, let’s pretend that we’ve already bought everything we need and start assembling.

Connecting the motherboard to the. hull

If you perform preventive disassembly you need to first disconnect all wires and cables from the motherboard, unscrew the screws which secure it to the case, and remove the dust which has accumulated under the board. To do this, it’s ideal to use a vacuum cleaner turned on at low speed and. A big lady’s makeup brush 🙂 The latter, like a broom, perfectly rakes out the fine dust from every corner of your “system” and all the expansion cards.