About 6 months ago I built myself a desktop. A few weeks ago the computer started to act strange, for example it wouldn't always give a video signal when it came out of sleep.

Now the issue has become persistent. I can start the PC and it works fine, but if i shut it down and start it up again it wouldn't give video output. The power LED and fans are running, but it never boots. No video signal, no post screen: nothing. When i leave the power off for like one night it would start the following day without any problems. It seems like it needs to discharge before it runs normal?

Anyway, it seems like capacitors are broken (like mentioned here: Computer won't start unless power is removed for ~5 minutes). But I can't really figure out if its the motherboard or PSU? I do not see or hear any abnormalities on my motherboard/PSU. What should be the defective component?

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    Do you have others PSU units to test with? – Little Helper Nov 1 '14 at 13:01
  • Unfortunately not. – user1226868 Nov 1 '14 at 13:06
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    I would say it's your PSU. If you can (meaning that the unit isn't under any warranty), carefully, open it up and inspect it, maybe it needs some cleaning. For example, I clean mine PSU once every 6 months. – Little Helper Nov 1 '14 at 13:09
  • I suppose cleaning the PS makes it seem like you're doing something, but it's not going to fix this problem. A long shot might be to replace any "coin" battery that may be on the motherboard, but a problem with the reset line seems more likely. I don't recall whether the reset is generated out of the PS or off the MB in current designs. – Daniel R Hicks Nov 1 '14 at 13:14
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    I'm going to send the PSU for RMA, i will keep you guys updated. – user1226868 Nov 3 '14 at 16:28

Turned out to be the PSU! I bought a new one and it fixed the problem, permanently.

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