Computer keeps crashing and won't turn on without a CMOS reset

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hymness

Reputable
Jun 26, 2014
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4,510
Hi people!

I'll try to be clear since english isn't my first-language.

Last week, I OC'ed my CPU in order to get some more juice from it (doing some demanding emulation). I started by using the Asus software auto-tuning, which gave me something like 4,9 GHz (while the Vcore often went beyond 1,5V)... I was afraid my CPU would die if I keep it that way, so I did it again, stopping it to 4,4 GHz (with a VCore not exceeding 1,35V, which, as I saw while doing some researchs, was okay). I monitored my CPU temp and didn't go beyond 45 degress (Celsius), and I was satisfied. So for the last week, I've been playing on my computer with those specs, and everything went fine.

Except for today... While doing some web-browsing, computer crashed (no blue screen, just... well shut itself off). And it wouldn't boot again...

Green LED on the mobo is lit, but computer will not boot... Tried to reset the CMOS and it worked. Restore the BIOS settings to default, computer boots, everything is fine... Then, crashed again. Same thing. Would need to reset CMOS to make it work again...

Here's my rig:

Mobo: ASUS P8Z77-V LX
CPU: core i5-2500k 3,3 GHz
PSU: Corsair TX650
RAM: HyperX Blu 4 Gb * 2
Ventirad: Cooler Master Hyper 212 Plus

Thanks for your help!

Regards,

Hymness
 
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Guest

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i find it hard to believe that your CPU didn't go above 45C at full load with a hyper 212 plus. my 4770k with a thermaltake water 3.0 extreme still goes close 70C at full load when its not OCed. the hyper 212 is a great cooler for the money, but that's basically impossible if you were stressing the computer hard. it sounds like something may have been damaged. i would suggest putting everything at default in the bios, EVERYTHING, and then booting the computer and doing a stress test to see what temps are, and to see if it crashes. could just be the motherboard hopefullly. then i would go through the usual troubleshooting steps to see what component it is. for example, remove all ram except 1 stick, remove graphics, and test then
 
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yes the p8z77-v lx does have a heatsink. its a pretty nice motherboard as well.

wait, no it doesnt, i misread the P8Z77-V LV from the P8Z77-V LX
 
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H

hymness

Reputable
Jun 26, 2014
9
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4,510
Thanks for your return.

@Dirk_Kuyt: These were the temperature I monitored. They might be wrong tho. I didn't do a great stress test, but for the time I monitored the temps, they seemed to be steady at 40-41 degress celcius. As for your proposal for a stress test, it might be difficult since the computer put itself off after a short amount of time (last time I get it to boot, it crashed after 5 minutes while surfing the web).

I noticed that the ventirad may have moved a bit. Can a computer power itself off if the temperatures becomes too high for the CPU?

I might try to clean the CPU thermal compound and apply some other.

Thanks again!
 
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yes a computer will most likely power itself off if the cpu temps are too high. unfortunately, probably because it was damaged. you can definitely try to replace the thermal compound, but unless it was completely botched the first time around, its probably not the problem. if the paste wasnt adequate, you'd probably be getting higher temperatures than you're reporting
 
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H

hymness

Reputable
Jun 26, 2014
9
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4,510
Thanks Dirk_Kuyt.

What I don't understand is why I can't get it to boot without resetting CMOS, then will crash and won't boot up as long as I don't reset CMOS.

I'll try to monitor the temps again.

Thanks

EDIT: BTW, I build this PC myself, was my first, but it has been runnng great for the last 2 years.

EDIT 2: Just crashed again. CPU was running at 1,6ish GHz, Vcore under 1V, CPU temp at 27 C.

Some people on another forum questions if it could be the PSU that couldn't keep up.
 
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Guest

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yeah it can be frustrating. i know when i was trying to overclock my i7-4770k as high as possible i kept getting crashes where i would have to reset CMOS. but never anything like what you're experiencing. i don't necessarily understand it either, thats why im thinking it's probably a bad motherboard, as CPUs rarely go bad, even from overheating, because they will throttle or shut down if that is the case
 
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hymness

Reputable
Jun 26, 2014
9
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4,510
Just crashed again. CPU was running at 1,6ish GHz, Vcore under 1V, CPU temp at 27 C.

Some people on another forum questions if it could be the PSU that couldn't keep up.

I'll try to find myself a PSU at work tomorrow and will try with it.
 
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prkle

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Jan 10, 2014
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Very unlikely the PSU, but try that anyway. Motherboards with no VRM heatsink aren't intended for overclocking. They can handle a mild oc but after you start increasing core voltage, lifespan drops rapidly.
 
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Guest

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yes to the vrm comment. but i have had some wonky things happen to me because of a bad/inadequate PSU. i wouldnt rule it out just because its unlikely. just saying!
 
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