PC restarts after a while and is stuck in restart loop afterwards

[Tomwe]

Hi

 

First of all my system specs:

300 Watt PSU

Intel Core i7 4790

Nvidia 1050Ti

8GB 1600 RAM

Acer Noname Mainboard (Bios Version P11.B4)

 

Windows 10 Home 19044.1586 (64Bit)

 

And now my problem: As you can probably tell, I am currently working on a pretty old Acer Prebuild PC. The name of the PC is "Acer Aspire TC-705". This PC was later upgraded with a 1050Ti but nothing else was changed.

 

I gifted the PC to a friend 1 year ago but since a few weeks the PC randomly shuts down after running for a little while. Afterwards it keeps rebooting. When this happens I turn off the PC and wait for a few minutes which fixes the problem for some time.

 

First of all I removed the GPU for all further tests. After that I added another case fan. Since this did not really improve the situation I changed the stock cooler for an old Pure Rock 2 (with fresh thermal grease) I had lying around. Since then the situation seems better. The system can now survive a CPU Z stress test for 20 minutes until the problem occurs. The temps of the CPU are at 75°C at that point. This really seems odd since I see improvement but still no fix even though temps are absolutely fine. To be sure I ran 2 hours of memtest86 and also swapped the PSU for a completely new Marblebron 750 Watt. Memtest did not show any errors and the PSU swap did not change the situation.

 

At this point I am thinking some sensors might be broken and report wrong temps which leads to the restart. 

Checking HWmonitor shows TMPIN6 at 120-122°C. Since startup which is also kind of weird.

 

Another interesting thing is that running Prime95 with Small FFTs instantly causes the restarts. And I really mean instantly. It takes less than a second.

 

 

[podkall]

TMPIN6 could be a nonexistant sensor that HWmonitor gives a random tempature value, if the tempature isn't changing that should be the case

 

Also you noted that you had i7 4790 + Nvidia 1050Ti

 

according to whatpsu.com recomended PSU is at least 400W:

 

 

Could that give problems @ZetZet ?

 

If it's not a PSU problem then I don't know what the restarts are caused by..

[ZetZet]

7 minutes ago, podkall said:

If it's not a PSU problem then I don't know what the restarts are caused by..

He swapped the PSU already

 

 

Reseat the CPU, reseat the RAM. 

 

Could also be a motherboard VRM issue, those OEM mobos aren't particularly known for overbuilding their power delivery. Try pointing a fan, if you have one, directly at the VRM area and see if that helps stability. 

[Tomwe]

Thanks for your quick response

 

Regarding the 122°C I also thought it would just be a placeholder. But the number is changing which seems odd. It it fluctuating between 119°C and 120°C with max values at 122°C

 

The 400 Watt minimum is interesting but like I said I already swapped the PSU with a 750 Watt unit. So that should not be a problem.

[ZetZet]

2 minutes ago, Tomwe said:

Regarding the 122°C I also thought it would just be a placeholder. But the number is changing which seems odd. It it fluctuating between 119°C and 120°C with max values at 122°C

TMPIN is the VRM temperature, they could definitely be the reason why the PC shuts down. Also 100C is pretty normal for a budget board with no VRM cooling, 120C is on the high side though.

[Tomwe]

4 minutes ago, ZetZet said:

He swapped the PSU already

 

 

Reseat the CPU, reseat the RAM. 

 

Could also be a motherboard VRM issue, those OEM mobos aren't particularly known for overbuilding their power delivery. Try pointing a fan, if you have one, directly at the VRM area and see if that helps stability. 

 

Ok thats helpful. I already tried RAM.

 

Will try the rest now. Thanks

[Tomwe]

Ok so I tried cooling the VRM with a seperate fan. I also removed the motherboard from the case, so I could reach the exact position with my fan.

 

After cooling for 3 minutes I saw no change at all in the temperature. To see if the fan was strong enough I directed it to the PCH which resulted in a 3-4°C drop within 10 seconds. Also I touched parts of the VRM to check the temperature and it was warm but definitely not hot. I could've left my finger there forever without burning it. So 122°C seems unrealistic.

 

I would love to try disabling the BIOS setting which causes those restarts just to see if the PC survives

 

Is there any other possibility I could check?

[Tomwe]

Little update:

 

I disabled the following two options in the BIOS:

- System Temperature Shutdown

- CPU Temperature Shutdown

 

Still Prime95 instantly causes a reboot.