Computer won't turn on (Nothing else worked)

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.

If you recently added a new CPU on your computer, check if it's correctly inserted. Try to remove it and reinsert it again in the socket.

Also, you need to reapply a fresh thermal compound between the CPU and the heatsink once you put it back into the socket or if it the thermal compound hasn't been reapplied for a long period.

If you are not sure how, watch this video:

If your computer is no longer under warranty, you can take it to a computer repair store. The repair team will diagnose and solve the problem.