My computer won't turn on. When I press the power button, the LED lighting at the back flashes, and the fan moves a tiny amount, but it doesn't turn on. It does the same when I release the button. I had put the computer to sleep the night before (as usual), and it just wouldn't wake up today. It was showing the flashing sleep signal on the power button, indicating it was asleep and not off, but it still wouldn't wake.

I've tried holding down the power button, and I've tried removing and replugging the mains power, to no effect. There is a green light on the motherboard, so I believe it to be a power-related issue, but I don't know. All USB-plugged devices have their lights on as normal.

This is a video of what happens when I press and release the power button: https://www.dropbox.com/s/prgni6lixlyk4pk/TRIM_20180623_103057.mp4?dl=0


As the fans don't turn, just move a little bit and stop, it is most likely that your PSU is dead.

See also this post : Any way to tell apart a CPU defect from a mainboard defect?.

  • Any reason for the downvote? – harrymc Jun 23 '18 at 19:25
  • I just tried unplugging and replugging the power cables inside the computer, as well as vacuuming out the copious amounts of dust that had built up. Now there is no light or fan movement when the power button is pressed, but there is still a green light on the motherboard. – SUM1 Jun 23 '18 at 22:20
  • I think you have reached the limits possible for a non-professional. Your computer is sick. My guess of the PSU might be correct or not, but a professional repairman has the tools and the exchange components necessary for analyzing the problem. Recommended. – harrymc Jun 24 '18 at 9:06
  • I did the paperclip test (stuck a paperclip into the green and black wires of the 24-pin connector) and the power unit worked, surprisingly. The fan and LED stayed on until I cut the power. This makes it likely that it's a motherboard issue, but what are your thoughts on what I should do next, given this new info? I'm considering researching how to replace a motherboard, rather than sending the whole thing to a repair shop (last time I did that, they cleared some files without me requesting them to). – SUM1 Jun 27 '18 at 15:25
  • The motherboard is certainly one possibility, but I can't really tell what's wrong on your side from here. To avoid lost files, put your disk on another computer and take a backup, or maybe an image of the disk, before sending it to the repairshop. Otherwise you might spend your money for nothing. – harrymc Jun 27 '18 at 15:35

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