A fairly common problem among users is that the computer simply does not turn on. This refers to cases where the computer does not turn on at all, meaning that even the BIOS does not load.
To solve this problem, you need to identify its source and cause, and typically only a professional can do this. However, there is a certain range of the most common causes of such problems, which are not difficult to identify and even fix on your own.
So, to identify the source of the problem, you should open the computer's system unit, since problems most often occur inside it. If you have a laptop/tablet, contact professionals exclusively; do not even try to unscrew or open anything. Also, with a desktop computer, to perform diagnostics, you need to have at least some knowledge and experience in carrying out such procedures.
First, you should check the connections inside the computer; often the source of the problem is a poor connection of some wires, etc. In particular, check the connections from the power supply to the motherboard. If the connections are fine, check the (external) video card; you can even disconnect it and try to turn on the computer without it.
At this point, the general diagnostics probably end. Also, do not forget to check the wires connecting the HDD to the motherboard, etc. Thus, if during diagnostics you find a disconnected wire or damage, try to fix the problem yourself.
If you are not sure that you can fix the problem you found on your own, then contact a professional. But, as practice shows, most problems are minor and can be fixed by almost anyone who understands computers even a little.
Otherwise, contact a professional — they will quickly identify the source of the problem and fix it.
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Good luck!