Question PC suddenly shuts down randomly followed by reboot

DnL8

Prominent
Nov 3, 2019
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510
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So I have a PC for almost 6 and a half years now, that since mid December started to shut down randomly, followed by a reboot. It happened in the middle of the month, then in 4 days at the end of the month (27, 28, 29 and 31), and then at january 1st, 2nd, 3rd... It's doing it everyday at this point. It does shut down randomly but seems to be only around 5pm-8pm, I don't know if that's a coincidence or not. At that time, the pc has already been running for some hours, just like in the other days.

When it does shutdown, sometimes it is not able to boot back up right away. Sometimes it takes longer to POST, sometimes doesn't even POST. If it does POST, normally it just shuts back down some seconds after windows booted or even during boot, and keeps that boot loop. I need to keep the pc off for some minutes for it to be able to boot again. On the january 1st and 3rd it actually did boot successfully right after like nothing happened. However, if I boot into the bios, the pc does not shutdown and just stays there.

I was not doing any heavy tasks when the sudden shutdowns occurred, on the 28th the PC was actually just idling for some time when I heard it shutdown. The PC does turn back on automatically, even after I disabled the "Power On after power loss" option in bios.

This problem started to happen some days after I installed more RAM, from 8gb (2x4gb) to 16gb (4x4gb), but I have tried running the PC without the new RAM and it still happens, so I think it was just a coincidence. I also did run memtest after that and concluded that one of my old sticks is faulty (recent problem, I remember running memtest before), but since then I remove it (running with 12gb of ram) and the problem persists. I also installed a SSD 2 years ago, so that's another upgrade that was done.

I have tried:
  • full scan for malware
  • checked event viewer but nothing weird seems to happen before
  • checked windows for errors with SFC and DISM
  • went back to my two old sticks of ram (2x4gb)
  • removed CPU overclock
  • booted without the hdd and the DVD drive (still booting from SSD since it did not happen in BIOS)
  • reseated RAM
  • reseated the psu cables
  • booted directly on the motherboard without the power button connected
  • removed gpu and booted using the integrated graphics
  • removed the CMOS battery to reset the bios
  • went back to an older GPU driver, since I've updated the drivers recently
In every case the problem persisted.

There are no weird noises that I can hear, temperatures are ok for everything (cpu, gpu and motherboard idling at around the 30s, 20s for the ssd and hdd). Under load, cpu and gpu get to around 50/60. Can't see any blown capacitors on the motherboard either.

Voltages also seem to be ok, +12V is always between 11,93V and 12,25V, that's the minimum and maximum I've seen.

I can't replicate the problem so it's really hard to test stuff. I still want to try booting from another disk with a fresh install and try a different power supply, but I need to do it when it starts boot looping again... I did boot from a USB stick I have here with the w10 installation and it did not shutdown there (when it was boot looping going to windows). Could it be the motherboard? CPU? I've seen on some threads talking about the CMOS battery, could it be that as well? The system doesn't seem to forget the date and time with the power disconnected for some time, so it doesn't seem to be that low. However I have removed it to also reset the bios.

It seems like an hardware problem, since it shuts down suddenly. The fact that it is only if I start windows makes me think there's some problem with the SSD maybe. Is the SSD bad?

System specs:
  • Intel Core i5-4670k 3.4Ghz
  • Cooler CPU Cooler Master Hyper 212 Evo
  • ASRock Z87 Pro3
  • Hyperx Fury 1600Mhz CL10 DDR3 16GB (4x4GB)
  • ASUS GeForce GTX 760 DirectCU II
  • XFX TS550 550W 80 Plus Bronze
  • Toshiba TR200 3D TLC SATA III 2.5" SSD 240GB
  • Western Digital Blue 1TB 7200RPM 64MB SATA III
  • Windows 10 Home 64-bit
Event Viewer:
  • 19/12/2020 19:57:45 - The previous system shutdown on ‎19/‎12/‎2020 at 19:48:18 was unexpected.
  • 19/12/2020 20:04:13 - The previous system shutdown on ‎‎19/‎12/‎2020 at 19:57:45 was unexpected.
  • 20/12/2020 16:28:00 - The previous system shutdown on ‎‎20/‎12/‎2020 at 15:53:45 was unexpected. (bluescreen caused by tcpip.sys)
  • 27/12/2020 19:52:19 - The previous system shutdown on ‎‎27/‎12/‎2020 at 19:19:17 was unexpected.
  • 28/12/2020 19:58:03 - The previous system shutdown on ‎‎28/‎12/‎2020 at 19:34:08 was unexpected.
  • 28/12/2020 20:01:53 - The previous system shutdown on ‎‎28/‎12/‎2020 at 20:00:34 was unexpected.
  • 29/12/2020 20:10:36 - The previous system shutdown on ‎29/‎12/‎2020 at 20:10:21 was unexpected.
  • 31/12/2020 21:12:26 - The previous system shutdown on ‎‎31/‎12/‎2020 at 20:12:51 was unexpected. (a lot of times in a row)
  • 01/01/2021 19:49:12 - The previous system shutdown on ‎01/‎01/‎2021 at 19:37:44 was unexpected.
  • 02/01/2021 17:03:15 - The previous system shutdown on ‎‎02/‎01/‎2021 at 16:45:51 was unexpected. (wrong, it was like at 17:02) (4 times in a row)
  • 02/01/2021 19:21:42 - The previous system shutdown on ‎02/‎01/‎2021 at 19:20:07 was unexpected.
  • 03/01/2021 19:39:34 - The previous system shutdown on ‎‎03/‎01/‎2021 at 19:37:56 was unexpected.
 
Jan 2, 2021
3
0
10
0
I have the same problem, I've seen that it can be the PSU. It might be at the end of its life. You could try replacing it and see if the crashes still happen. I haven't fixed mine yet, but I'm going to try soon and I will let you know what fixes it.
 

DnL8

Prominent
Nov 3, 2019
6
0
510
0
I have the same problem, I've seen that it can be the PSU. It might be at the end of its life. You could try replacing it and see if the crashes still happen. I haven't fixed mine yet, but I'm going to try soon and I will let you know what fixes it.
Can you enter the bios and stay there? It does not draw as much power as booting into windows, so PSU could be a problem. I might get another PSU to test. The only thing that is bothering me is the fact that is always at around the same time of the day that this happens...
 
Jan 2, 2021
3
0
10
0
Can you enter the bios and stay there? It does not draw as much power as booting into windows, so PSU could be a problem. I might get another PSU to test. The only thing that is bothering me is the fact that is always at around the same time of the day that this happens...
Yes I'm abled to use my pc normally until it crashes. After that it reboots and works perfectly again. So the crashes I have are really hard to troubleshoot as it could be anything...
 
So I have a PC for almost 6 and a half years now, that since mid December started to shut down randomly, followed by a reboot. It happened in the middle of the month, then in 4 days at the end of the month (27, 28, 29 and 31), and then at january 1st, 2nd, 3rd... It's doing it everyday at this point. It does shut down randomly but seems to be only around 5pm-8pm, I don't know if that's a coincidence or not. At that time, the pc has already been running for some hours, just like in the other days.

When it does shutdown, sometimes it is not able to boot back up right away. Sometimes it takes longer to POST, sometimes doesn't even POST. If it does POST, normally it just shuts back down some seconds after windows booted or even during boot, and keeps that boot loop. I need to keep the pc off for some minutes for it to be able to boot again. On the january 1st and 3rd it actually did boot successfully right after like nothing happened. However, if I boot into the bios, the pc does not shutdown and just stays there.

I was not doing any heavy tasks when the sudden shutdowns occurred, on the 28th the PC was actually just idling for some time when I heard it shutdown. The PC does turn back on automatically, even after I disabled the "Power On after power loss" option in bios.

This problem started to happen some days after I installed more RAM, from 8gb (2x4gb) to 16gb (4x4gb), but I have tried running the PC without the new RAM and it still happens, so I think it was just a coincidence. I also did run memtest after that and concluded that one of my old sticks is faulty (recent problem, I remember running memtest before), but since then I remove it (running with 12gb of ram) and the problem persists. I also installed a SSD 2 years ago, so that's another upgrade that was done.

I have tried:
  • full scan for malware
  • checked event viewer but nothing weird seems to happen before
  • checked windows for errors with SFC and DISM
  • went back to my two old sticks of ram (2x4gb)
  • removed CPU overclock
  • booted without the hdd and the DVD drive (still booting from SSD since it did not happen in BIOS)
  • reseated RAM
  • reseated the psu cables
  • booted directly on the motherboard without the power button connected
  • removed gpu and booted using the integrated graphics
  • removed the CMOS battery to reset the bios
  • went back to an older GPU driver, since I've updated the drivers recently
In every case the problem persisted.

There are no weird noises that I can hear, temperatures are ok for everything (cpu, gpu and motherboard idling at around the 30s, 20s for the ssd and hdd). Under load, cpu and gpu get to around 50/60. Can't see any blown capacitors on the motherboard either.

Voltages also seem to be ok, +12V is always between 11,93V and 12,25V, that's the minimum and maximum I've seen.

I can't replicate the problem so it's really hard to test stuff. I still want to try booting from another disk with a fresh install and try a different power supply, but I need to do it when it starts boot looping again... I did boot from a USB stick I have here with the w10 installation and it did not shutdown there (when it was boot looping going to windows). Could it be the motherboard? CPU? I've seen on some threads talking about the CMOS battery, could it be that as well? The system doesn't seem to forget the date and time with the power disconnected for some time, so it doesn't seem to be that low. However I have removed it to also reset the bios.

It seems like an hardware problem, since it shuts down suddenly. The fact that it is only if I start windows makes me think there's some problem with the SSD maybe. Is the SSD bad?

System specs:
  • Intel Core i5-4670k 3.4Ghz
  • Cooler CPU Cooler Master Hyper 212 Evo
  • ASRock Z87 Pro3
  • Hyperx Fury 1600Mhz CL10 DDR3 16GB (4x4GB)
  • ASUS GeForce GTX 760 DirectCU II
  • XFX TS550 550W 80 Plus Bronze
  • Toshiba TR200 3D TLC SATA III 2.5" SSD 240GB
  • Western Digital Blue 1TB 7200RPM 64MB SATA III
  • Windows 10 Home 64-bit
Event Viewer:
  • 19/12/2020 19:57:45 - The previous system shutdown on ‎19/‎12/‎2020 at 19:48:18 was unexpected.
  • 19/12/2020 20:04:13 - The previous system shutdown on ‎‎19/‎12/‎2020 at 19:57:45 was unexpected.
  • 20/12/2020 16:28:00 - The previous system shutdown on ‎‎20/‎12/‎2020 at 15:53:45 was unexpected. (bluescreen caused by tcpip.sys)
  • 27/12/2020 19:52:19 - The previous system shutdown on ‎‎27/‎12/‎2020 at 19:19:17 was unexpected.
  • 28/12/2020 19:58:03 - The previous system shutdown on ‎‎28/‎12/‎2020 at 19:34:08 was unexpected.
  • 28/12/2020 20:01:53 - The previous system shutdown on ‎‎28/‎12/‎2020 at 20:00:34 was unexpected.
  • 29/12/2020 20:10:36 - The previous system shutdown on ‎29/‎12/‎2020 at 20:10:21 was unexpected.
  • 31/12/2020 21:12:26 - The previous system shutdown on ‎‎31/‎12/‎2020 at 20:12:51 was unexpected. (a lot of times in a row)
  • 01/01/2021 19:49:12 - The previous system shutdown on ‎01/‎01/‎2021 at 19:37:44 was unexpected.
  • 02/01/2021 17:03:15 - The previous system shutdown on ‎‎02/‎01/‎2021 at 16:45:51 was unexpected. (wrong, it was like at 17:02) (4 times in a row)
  • 02/01/2021 19:21:42 - The previous system shutdown on ‎02/‎01/‎2021 at 19:20:07 was unexpected.
  • 03/01/2021 19:39:34 - The previous system shutdown on ‎‎03/‎01/‎2021 at 19:37:56 was unexpected.
You can't really mix and match ram without a chance of problems like you are experiencing. Try with just the new ram installed.
 

DnL8

Prominent
Nov 3, 2019
6
0
510
0
Yes I'm abled to use my pc normally until it crashes. After that it reboots and works perfectly again. So the crashes I have are really hard to troubleshoot as it could be anything...
Yes, that's exactly what I'm experiencing as well...

You can't really mix and match ram without a chance of problems like you are experiencing. Try with just the new ram installed.
I already tryed a lot of combinations, only with the old RAM and only with the new and it still occurs.
 

DnL8

Prominent
Nov 3, 2019
6
0
510
0
It could be the power supply can you test with a different one?
I'll have to do that. The only PSU I have on me to test is an old ~250W power supply but it is working fine. I might test it without the GPU installed, just so it doesn't shutdown for not having enough power.

Today's update btw:
  • 04/01/2021 19:53:14 - The previous system shutdown on ‎‎04/‎01/‎2021 at 19:52:31 was unexpected.
  • 04/01/2021 20:45:53 - The previous system shutdown on ‎04/‎01/‎2021 at 19:54:53 was unexpected.
 
Last edited:
I'll have to do that. The only PSU I have on me to test is an old ~250W power supply but it is working fine. I might test it without the GPU installed, just so it doesn't shutdown for not having enough power.

Today's update btw:
  • 04/01/2021 19:53:14 - The previous system shutdown on ‎‎04/‎01/‎2021 at 19:52:31 was unexpected.
  • 04/01/2021 20:45:53 - The previous system shutdown on ‎04/‎01/‎2021 at 19:54:53 was unexpected.
If you bought the power supply when you built your system over 6 years ago then you got your moneys worth out of it, perhaps it is time for a new one.
 

DnL8

Prominent
Nov 3, 2019
6
0
510
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Update:
So on January 5th in the morning I updated windows 10 from v2004 to v20H2 (I don't think that was the problem).
I also was going to swap the PSU with the old 300W one, without the GPU connected, to make sure it was my PSU's fault, but the CPU connector was only 4-pin instead of 8-pin...
So I just removed my PSU from the case and cleaned the dust. After that I did not get any shutdown on the 5th, 6th and 7th.
So I think that was the problem, I will get back if it happens again.
Thanks to everyone.
 

DnL8

Prominent
Nov 3, 2019
6
0
510
0
  • 09/01/2021 20:00:27 - The previous system shutdown on 09/‎01/‎2021 at 19:53:16 was unexpected.
  • 09/01/2021 20:05:56 - The previous system shutdown on 09/‎01/‎2021 at 20:00:28 was unexpected.
  • 09/01/2021 20:21:09 - The previous system shutdown on 09/‎01/‎2021 at 20:15:41 was unexpected.
Yeah, that didn't last long...
I'll be replacing the power supply
 

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