PC keeps restarting Please help!

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Seb Richards

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Apr 28, 2015
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So I built my rig around 8 months ago, everything was running fine.
Specs -

CPU - AMD FX 6300 6 core Processor 3.50ghz, stock cooler
RAM - 8gb Corsair Vengence
Mobo - ASUS M5A97 Evo R2.0
GFX - Nvidia GeForce GTX 750 ti
PSU Corsair 500w CX

It was so strange, all was fine, then after a few hours on Diablo 3 boom, cuts out, no blue screen, no error showing except for the Kernal 41 meaning the computer wasn't shutdown properly. After that its been a fairly regular daily occurrence when I'm gaming.
Its very intermittent, for example it could be 10 minutes it could be 2 hours it could be 12 hours!
I've run Prime95+ on an intensive 24 hour stress test and everything was fine, CPU didn't go above 42 degrees. I've read several posts on here, but wasn't to try and narrow it down as I cant afford to just go and buy a new mobo ram and cpu! I've tried each stick of ram separately in all the ram slots to no avail. I've also reformatted to rule out any software issues.
Thanks in advance!

Seb
 
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clutchc

clutchc

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That can be one of the hardest problems to track down. I would first suspect the PSU. It may not be bad, it may simply have a poor connection that loses electrical contact upon heating up. Check that the 24 pin connector (and the CPU 4/8 pin connector) are firmly in their headers and that their locking tabs are over the headers' nub.

It could even be the case's reset switch is making intermittent contact when it shouldn't. You might try unplugging the reset pair at the FP header to eliminate that possibility. Same could go for the power button. But that's less likely as it would have to make contact for about 5 seconds to cause an actual shut down, not a restart.

The PSU itself could be momentarily dropping the voltage below the required amount to keep the system running. You'd have to have access to another PSU to see if the Corsair is at fault, tho. The CX line does have a problem with poor grade capacitors that fail under heat.

Since you've gone so far as to do a fresh Win install, I'll assume it isn't a software conflict. It almost has to be hardware related.
 
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Seb Richards

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Apr 28, 2015
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Thank you for the extensive reply! This is slowly driving me mad! I will try your suggestions in the morning! Unfortunately the only other PSU I have lying around is a 300w from an old office PC which won't be any good so failing everything else you suggested I'll have to get a new one! Would you advice maybe going for a 600w?

Thanks again and ill update you with what happens

Seb
 
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clutchc

clutchc

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600W would not be necessary for the system you have now. The GTX 750 Ti is pretty light when it comes to power draw. 60W at stock. Nvidia only recommends a 300W PSU min. for systems with that card. But if you plan on upgrading the card in the future and/or if you plan on OC'ing, a 600W would be a good size to go with... as long as you buy a good quality unit. For future upgrading, even a 650W would not be overkill.

Btw, if your 300W PSU has a decent +12V rail, you could use it to test the situation. You wouldn't have to totally replace the Corsair. Just disconnect the cables and temporarily connect in the ones from the 300W PSU. Then see if you can get the problem to repeat. The only drawback would be, that if the reboot returns, you won't know if the problem is NOT the Corsair PSU... or if the old 300W just doesn't have the capacity to keep the system powered. Probably not a reliable test, now that I think about it...
 
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rakzeroth25

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If you could help me out as well, my computer keeps restarting from the boot screen. If I press F2 to get into the boot menu that stays up. I'm assuming that means my computer holds power just fine. The temps are all checking out from this screen. Everything I know how to check seems normal. I opened it up and all wires seem in good condition. It's a brand new computer that was built by someone else. Barely even any dust inside yet. It's running on a Windows 10 pro preview system if that means anything to you. If it updated and made my computer crash like this it never makes it far enough for me to do a rollback. The closest I get to the computer actually getting a full restart is about 1 second of the windows flag after the boot menu options. The only issue I've had with this computer so far is that it always runs this error screen telling me that it failed to shutdown properly every time I shut down and turn it off. It restarts on it's own and has always been fine after that. This isn't giving me any error messages though. Just a constant restart loop.
 
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clutchc

clutchc

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As I said to Seb, that is one of the hardest problems to track down. It could still be the PSU. Too weak for the CPU and GPU installed, too cheap, or just defective. List your specs.
 
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DanieleLC

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Victorion

Victorion

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Yeah depending on the models, most CPUs are fine with 60-75°C

However the 30°C is recommended temperature for the capacitors inside the PSU, and it may be different from the temperature of you cpu, gpu etc.

NB. Don´t open PSU unless you know what you´re doing. It can be dangerous.
 
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