Maybe faulty or damaged hardware component prevents your computer from turning on. It may be the power supply, the motherboard, (one of) the RAM memory stick(s), the graphic card, the hard disk drive, a broken data cable and etc.
The difficult part is locating the right culprit and that is why every hardware component need to be tested separately.
Unless you know how, it is wise to call a IT repair guy who will find and replace the bad hardware component. If you feel that you can troubleshoot the computer check out this article, which should guide you if you need help.
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