Computer turns on for 1/2 a second

I have a relatively new build. It was working perfectly at first, but recently has this issue: when I try to wake up the computer from sleep mode "too soon" after it goes to sleep, or right after I plug it in, everything powers up for half a second, then it dies. The only way to get it working is to unplug it, plug it back in, wait 30 minutes, and then start it.

On top of this, occasional it goes into sleep mode before it should, and when I try to use it, I encounter the problem above. Also on a few occasions it will spin up, but makes a loud, high pitched constant noise until it is shut down. Once I shut it down, I have to wait the aforementioned 30 minutes before turning it back on. What in the heck can I do about this? Thank you in advance for any help or advice.
 
Honestly, it sounds like several issues...pretty hard to troubleshoot, too.

- high pitched constant noise sounds like keyboard error - sometimes if a key is constantly depressed, but could be dying fan somewhere
- delayed restart "wait 30" sounds like thermal fuse resetting - short might cause that
- "sleep mode restart" issues sounds like bad 'power good' or a PSU problem

Start by turning off sleep and hibernate modes - get the hardware right first.

Swap keyboards.

Look for loose connections.

Possible ground issues - loose screw, dropped screw, standoff in wrong place?

You may wish to try a bench top rebuild sooner than later.

 
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Honestly, it sounds like several issues...pretty hard to troubleshoot, too.

- high pitched constant noise sounds like keyboard error - sometimes if a key is constantly depressed, but could be dying fan somewhere
- delayed restart "wait 30" sounds like thermal fuse resetting - short might cause that
- "sleep mode restart" issues sounds like bad 'power good' or a PSU problem

Start by turning off sleep and hibernate modes - get the hardware right first.

Swap keyboards.

Look for loose connections.

Possible ground issues - loose screw, dropped screw, standoff in wrong place?

You may wish to try a bench top rebuild sooner than later.



Cycloid Torus, thanks for the advice! I did the rebuild and DID find a dropped screw! Things are working beautifully now.
 
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