Mysterious Computer Shut Off...(Breadboarding)

[The Frozen Mind]

Computer shuts off randomly (after hours unplugged)
Scenario:

1. Computer shuts off on cold boot (after hours unplugged/switched off) at Windows desktop around 2 minutes.
2. After the shut off - powering on the PC again and it runs perfectly (passed all burn-in test). Runs pc games perfectly 8 hours to 12 hours. Ex. Wasteland 2

Troubleshooting I made:
1. Cleaned PC thoroughly using compressed air.
2. New thermal paste applied on the processor.
3. Video card and Memory contact cleaned with rubber eraser.
4. Reconnected all cables and checked for loose cables.
5. Bought a new power supply. (Deepcool DE530 400 watt rated)
6. Removed all hardware. Only the Processor and motherboard are running.
7. Memtest and MEmtest86 memory at boot up. Passed. No errors.
8. New CMOS battery
9. Bios jumper reset at motherboard.
10. New Windows 7 home installation. Dual boot removed. (Linux)
11. Capacitors not bloated. (top and bottom)
12. Bread-boarding (motherboard and Processor only) still shuts off at cold first boot.
13. CMOS downgraded to original version.
14. Checked power strip and Automatic Voltage Stabilizer/Regulator for fault.
15. Passed ALL Burn-in Tests of Different Burn in Software.

After troubleshooting it still shuts off randomly at the first cold boot.

Processor: AMD Athlon X3 435
Motherboard: Asrock N68C-S-UCC motherboard.
DIMM: 2x 2gb DDR3 memory kit 1333mhz
ROM: Asus DVD rom RW
Nvdia GT630 DDR3
Old PSU: Great Wall Black series 450wl (old)
Brand New PSU bought to check if old PSU had a problem): Deepcool DE530 rated 400 watts

Now all I can think of is the Processor and Motherboard.
Do you think it's the Processor or the Motherboard that is Faulty?

Thank You.

 

[RLGL]

please explain:
after hours unplugged/switched off

 

[The Frozen Mind]

please explain:
after hours unplugged/switched off

When Shutting down the computer properly. then switching off the power strip or unplugging the computer from the wall outlet.
when I power it on again the next day, there is a 50-70% chance it would "Shut off" on the first cold boot.

 

[VirtualLarry]

when I power it on again the next day, there is a 50-70% chance it would "Shut off" on the first cold boot.

That was actually common for Core2-era Intel 775 motherboards, especially when overclocked, when booting for the first time after AC power was applied to the PSU. It was called a "double-post". But this would happen right after POST, it would shut down and POST again, and then it would boot. If there is a 2-minute delay, that doesn't sound like what's going on here.

Are you "unlocking cores"? Do you have that enabled in BIOS? That could explain the behavior that you're seeing.

That said, that's a bunch of really old, really low-end kit. I attribute your issues to GIGO = Garbage (hardware) In, Garbage (crashes) Out.

Buy some decent modern hardware.

Even consider a used / refurb Dell PC with an i3-2120 or something, should be able to pick those up complete with OS, HDD, etc., for less than $80 USD online. That would be a lot better than what you're using, and a lot higher quality overall, I feel, even considering the refurb status of it. Check ebay seller's feedback rating and comments to be sure, though.

 

[The Frozen Mind]

That was actually common for Core2-era Intel 775 motherboards, especially when overclocked, when booting for the first time after AC power was applied to the PSU. It was called a "double-post". But this would happen right after POST, it would shut down and POST again, and then it would boot. If there is a 2-minute delay, that doesn't sound like what's going on here.

Yes, possible that the motherboard is already faulty? anyway it's old. (6 years)
I just find it mysterious when it works great after that "cold boot shut off" it just started this shut off problem a month ago.

is this also possible that some parts are loosing it's charge? and when powering on it shuts off because it lacks power/charge, then when powering on again it is now charged and now works great. later if unplugged/powered off properly, again looses it's charge? (example: Capacitors).

my other option is to buy a new motherboard. but I just want to make sure. I already bought a new PSU.

 

[The Frozen Mind]

That was actually common for Core2-era Intel 775 motherboards, especially when overclocked, when booting for the first time after AC power was applied to the PSU. It was called a "double-post". But this would happen right after POST, it would shut down and POST again, and then it would boot. If there is a 2-minute delay, that doesn't sound like what's going on here.

Are you "unlocking cores"? Do you have that enabled in BIOS? That could explain the behavior that you're seeing.

That said, that's a bunch of really old, really low-end kit. I attribute your issues to GIGO = Garbage (hardware) In, Garbage (crashes) Out.

Buy some decent modern hardware.

Even consider a used / refurb Dell PC with an i3-2120 or something, should be able to pick those up complete with OS, HDD, etc., for less than $80 USD online. That would be a lot better than what you're using, and a lot higher quality overall, I feel, even considering the refurb status of it. Check ebay seller's feedback rating and comments to be sure, though.

Cores not unlocked, no overclocking made.
I got the new AMD RYZEN 5.
but. just curious what seems to be faulty on this old hardware. being a tech, it just feeds my curiosity.

 

[VirtualLarry]

It could have something to do with Windows 10's Fast Startup feature.. Maybe it's trying to boot using the hibernation image, and punting, and re-starting.

Try disabling Fast Startup in Windows.

 

[The Frozen Mind]

It could have something to do with Windows 10's Fast Startup feature.. Maybe it's trying to boot using the hibernation image, and punting, and re-starting.

Try disabling Fast Startup in Windows.

it's on Windows 7.
probably just let it retire, and let the mystery of the shut off, remain a mystery until the end of time.

will just do more tests, change the processor and see if it shuts off.
if it does.
I would confirm it's a faulty motherboard still trying to survive.

 

[VirtualLarry]

Yeah, I mean, that's not exactly a high-end board, and it is near the limit of a motherboard's life, if it does't have solid capacitors. (It doesn't, does it? I didn't look up pics of the board.)

If it has solid caps, then it might be worth diagnosing, but if the board has electrolytics, then just junk it, it's not really worth fixing. (Or put it on ebay as "AS-IS NOT WORKING". Might get $10 for it from someone looking for a bargain or a re-cap project. You never quite know.)

 

[The Frozen Mind]

Yeah, I mean, that's not exactly a high-end board, and it is near the limit of a motherboard's life, if it does't have solid capacitors. (It doesn't, does it? I didn't look up pics of the board.)

If it has solid caps, then it might be worth diagnosing, but if the board has electrolytics, then just junk it, it's not really worth fixing. (Or put it on ebay as "AS-IS NOT WORKING". Might get $10 for it from someone looking for a bargain or a re-cap project. You never quite know.)

Yes, it only had 1 Solid Capacitor, the rest of it are electrolytic capacitors.
but, I will still try to change the processor to confirm. anyway I had a lot AM3+ processors. just to finalize everything before I quit. lol
will just update if it's really a faulty motherboard.

thanks for the time man.

 

[Pick2]

Try measuring the back up battery , it might be dead. It's a little flat silver coin battery on the motherboard. It is probably 3.3 volt.

 

[The Frozen Mind]

Try measuring the back up battery , it might be dead. It's a little flat silver coin battery on the motherboard. It is probably 3.3 volt.

Already changed the bios battery on the motherboard.