Computer System Unit Does Not Start

The problem situation, when the PC system unit does not turn on, is not so often. Therefore, the user most likely does not have much experience in solving such problems. But the causes of such a malfunction can be very many.

Before arming yourself with a screwdriver and a tester, ask yourself a few questions and only after answering them make a decision about further actions.

  • Look at the documentation. if the guarantee is still not over, take the system technician to the workshop.
  • How expensive is your computer and how long has it been in your possession? If the equipment is expensive and fairly new. it is better not to risk with self-repair.
  • Do you consider yourself a technically competent user? If not, go to the service center again.

Most likely, the idea of ​​independently figuring out why the system unit does not turn on came about because your computer is old enough and there is nothing left on the card. Yes, and urgent matters on the Internet are running out. Then try to go in a simple but logical way.

Computer System Unit Does Not Start

What are the symptoms of a malfunction?

What specifically doesn’t work? No emotions at all, or were there any attempts to start? Perhaps the patient made some kind of mournful sounds, trying to talk about his illness?

Something can be understood from system signals. For each type of PC, the sound alarm will be different. Therefore, see the datasheet.

If the desktop turns on and then turns off again. most likely, the power supply is working, and there is electricity in the network. If there are no reactions at all, turn on the light or the radio in the room to make sure that you have not been cut off the electricity for chronic non-payment.

The next step is to check the entire path of electric current from the outlet to the device. Do you have an uninterruptible power supply? If it works and the PC does not turn on, the UPS may malfunction. Try restarting it.

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Check the integrity of the cables, whether they are firmly inserted into the sockets. If the intermediate distributor has overload protection, see if the adapter has disconnected due to too many consumers turned on at the same time.

Video: Computer System Unit Does Not Start


A common cause of device inoperability is the failure of the cooling fan of the power supply. Perhaps the blades fell off. Open it and carry out a visual inspection.

Are capacitors swollen? If the computer is very old, the electrolytes may have dried. This appearance is not always determined. It is possible to reliably verify serviceability only by replacing it with a known worker. Voltage testing does not give a guarantee.

If you recently added some modules to your PC, upgraded, it is possible that the power of the old power supply is not enough. To check this, try temporarily disconnecting everything that was recently connected.

If you have any duplicated modules, for example, two hard drives, many RAM slots, you can sequentially turn off duplicates and try to turn on the device again. If the matter is overload, at some stage of shutdowns everything should work. Then you are lucky. you only need to purchase a power supply more powerful.

A common problem is a malfunction of the Start button. Contacts from frequent switching on wear out, and once the current simply does not enter the PC. Try to gently close the start button with a screwdriver. If the problem is in it. the computer should start loading Windows.

System problems

If the desktop turns on, it works for a while, some messages flash on the screen, and then everything turns off. it looks like the blocks inside the system unit have failed.

Or a thick layer of dust has accumulated inside the computer case. Or the contacts in the connectors have oxidized. If there really is a lot of dust. pick up a soft brush, a vacuum cleaner and start internal cleaning.

After that, sequentially disconnect the contactors and use a school gum (eraser) to clean the copper contacts from oxides and carbon deposits. Do not disconnect everything at once. otherwise you will forget what should be connected to. Disconnect and clean the contactors one by one.

After disassembling and cleaning the detached connector, it is best to close the device again and try to turn it on. So it will be possible to accurately determine the cause of the malfunction.

Disconnect all unnecessary

Now you can begin to search for the faulty module. Disable absolutely everything except the most necessary, without which the computer cannot work at all:

  1. Power Supply.
  2. Motherboard.
  3. One panel of RAM.

If the PC starts working, it means that exactly one of the blocks is faulty or incorrectly connected. After that, start inserting blocks one at a time and try to turn it on. As soon as the desktop stopped starting up. this is the faulty module and you need to look for a replacement for it.

If, after you turned off everything unnecessary, the computer still does not want to turn on, it is likely that the motherboard itself is faulty. Carefully inspect the board. The presence of swollen capacitors indicates a malfunction. The cost of repairing the motherboard is much lower than buying a new one. Therefore, you can give the motherboard for repair.

Sometimes the cause of not turning on the computer is a dead system battery. Although the computer usually works, it’s just that time is constantly getting lost. If in your last days the system clock of the computer was not fixed and it was passed after each session to reconfigure. the battery has run out. In rare cases, a dead battery may cause the computer to not turn on at all. Try a deliberately new battery.