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Hope you guys are still around

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I've been building PCs for more than 40 years, but this is a new one on me. The system worked perfectly for about 25 days with no problems, installing and running about 10 different Linux versions. One day, I powered it up. It ran for about 20 seconds or so, then spontaneously powered down. After 10 seconds, it powered back on and continued to stay powered on for at least 10-15 minutes before I shut it down. No video output came on and the system never posted. I thought it might be the power supply and changed it out for a new one. Got exactly the same results.

Hardware is a Chinese X79 motherboard with a Xeon E5-2649, 16 GB of DDR3-1333 RAM, and a 512 MB M.2 SSD. Cooler is a Noctua tower cooler with a 120mm fan. Power supply is a Raidmax Vortex 635W (the old one was a Raidmax RX-630SS). Video card is a Nvidea GT740 SC.

As I said, it worked perfectly for nearly a month. So, how screwed am I?
 
is this an old PC, or a Frankenstein of parts that make up a 'new' PC?
how old is the unit? (or how long had it been running reliably for)

have you tried reformatting the drive back to a clean slate and installing an OS from scratch?
 
Hello

Which Linux version were you using when this happens?
It's probably PCLinuxOS, but I can't be certain. The system is my 'sand box'; I installed 10-`15 different Linux distros in the 25 days it was working, including Endeavor, Manjaro, Linux Mint, Debian Testing, Pop_OS, and others.
 
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is this an old PC, or a Frankenstein of parts that make up a 'new' PC?
how old is the unit? (or how long had it been running reliably for)

have you tried reformatting the drive back to a clean slate and installing an OS from scratch?
Everything in the system is new except the case and the video card. They had been used before as part of another working PC. It is a 'Frankenstein' system, but all the parts came from Amazon recently.

Since it won't post I haven't reformatted the SSD. It ran for about 25 days from the first time it was turned on. I don't mean it was on for 25 straight days, it was powered up and down on a daily basis. First power on was 11/9/22, 12/5/22 was when it started displaying the symptoms I mentioned. Total run time while powered up was probably about 100 hours, 3-5 hours a day.
 
To eliminate all the various OS's on the drive causing this issue, I'd be starting from a clean slate to rule out anything along those lines.
There's only one OS at a time on the computer. I wipe the SSD and start over for each new OS. I have to ask: If the PC won't post, what difference will wiping the SSD make? IIRC, the system should post with no storage attached. I will remove the SSD tonight and power on without storage to see what happens. I don't have another system to put the M.2 SSD in to wipe it right now.

I just want to clarify that the system was working perfectly when it was turned off on 12/4/22 as far as I could tell, the problems started with power up on 12/5/22.

Thanks for the suggestion.
 
Okay, I pulled out the M.2 SSD and booted the PC tonight. There is no change to the way it is (not) working. It still does not post.

I want to thank you folks for trying to help.
 
did you try clear cmos
 

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OK, no worries.

have you tried removing the memory and video card, wiping their circuit boards and motherboard slots and contacts with a soft bristled brush.
if the processor and motherboard allow, try booting without the graphics card.
also try only one memory stick at a time, and in different slots if the first slot didn't allow you to POST.
 
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