Is my CPU fried after testing Cinebench?

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zenonithus

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Hello all,

So did a cinebech test on PC. It bluescreened and restarted. On restart it couldn't detect the hard drive so rebooted again. I then went into BIOS as I realised my cpu and ram were over clocked so I selected the 'reset to Optimal defaults' and restarted. Now the PC remains in a boot loop, switching on and of for about half a second.

I then unplugged the power to the CPU and the PC boots fine, no bootloop. So does this mean my CPU is toast? Is there any other test I can do on the CPU to determine this (without having another PC?)
 
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HEXiT

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what kind of oc did you throw at it?
how high did you push it on speed and volts?

did you reset the bios completely or just load optimized defaults (reset the bios if you didnt)..

no it shouldn't bootloop generally after a stress test fail... normally a system would just load failsafe options on the reboot as most new hardware has self protection from high thermals. unless you skrimped on something important like a quality psu there shouldnt be any hardware issues.

so yeah clear the cmos and try again.


 
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zenonithus

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jankerson: I cant run anything at the moment as the PC is dead :D

HEXiT: I'm not sure on the voltages as the guy in the PC shop overclocked it for me many years ago. If I can find a video I made of his settings I will post it right away.

Just before the bootloop all I did was set the BIOS to 'Optimal factory defaults' when it started bootlooping after that I then reset the battery as well as pressed the clera cosmos button at the back and nothing.

I watched a youtube vid where a guy mentions after benchmarking if the computer shuts off before restarting it can send a voltage surge. He ended up frying his CPU after benchmarking and forgeting to reset his overclocked voltages by shutting down first rather than his system shutting down and rebooting: https://www.youtube.com/watch?v=ys24AJh42xA

The bottom line is the pc seems to boot up fine when there is no power to the CPU so I can only assume the CPU is now faulty. Just to rule out do you think setting the 'optimal factory reset' had anything to do with it? Could that cause a CPU overload or something?

System Specs:

Gigabyte X58A-UD3R Motherboard

Processor Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz, 2660 Mhz, 4 Core(s), 8 Logical Processor(s)

Installed Physical Memory (RAM) 12.0 GB

135 GB Velocorapter HDD (OS Installed)

LG CD, DVD, Blu-Ray reader/Writer drive

XFX Radeon HD 7970 graphics card - Radeon HD 7970 - 3 GB

M2 Silent Pro 850 w PSU
 
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zenonithus

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I just took out the CPU and cleaned the paste off. All thepins on the mobo look fine. Is there a way I can test the resto of the machine without the CPU? So it I boot it up with CPU power connected and no CPU attached is it safe to do that? If so would the MOBO beep which would mean it could not detect a CPU and is therefor working?
 
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zenonithus

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So my plan is to put the CPU back in and test if reseating it helped. If it's still dead I might just buy a cheap Intel Xeon Quad Core E5502 and see if the actual system is at fault.

One question, is it ok to test the PC with a potentially faulty CPU? The machine is not my main PC and I dont have any compatible parts to test with.
 
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zenonithus

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Unfortunately I don't have access to another PC I can test on. The cheap cpu I might buy to test is around £4 so wouldn't be losing much ;)

I think I tried clearing the cosmos with the battery though same thing boot loop. I think the PSU is ok as when I unplug power to the CPU it stops the bootloop and the computer powers on just with nothing on display etc.
 
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zenonithus

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I could really do with some advice people. Can setting the BIOS to optimised defaults settings cause this bootloop? when I disconnect the power to the cpu and the bootloop stops does this mean its a cpu issue? Or not necessarily?
 
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HEXiT

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unlikely. bootloops happen when either your hardware isnt being detected properly or your bios is trying to set voltages that are incompatible with your hardware.
all you can do is test the parts to see whats failed and replace it by the sounds of your issues.

try reseating the cpu and only use 1 ramstick to try booting.
 
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zenonithus

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Yeah it's frustrating not having anything to test the parts against. Though how would you explain the disconnecting CPU power and stopping the bootloop? Or could this be that power goes through to the CPU, then to another component that could be faulty?
 
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HEXiT

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without being able to test the parts its hard to say what the issue is. your motherboard is ud3 so should be pretty much a tank.
the cpu while old shouldnt be suffering electron wear unless you had excessive volts, temps or a badly set mem config (using the ram past 1.65v)
you dont know what your o.c was set to so you cant give any info on that... so your left with your solution. buy a cheap cpu and hope that allows you to test the system.
 
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zenonithus

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So I found the video of the over clocking. It looks like they overclocked the CPU from 2.8 ghz to 4 ghz. Voltage is set to 120000v and they changed max voltage from auto to 1.35000v. So I'm not sure if Cinebench blue screen had anything to do with this overclocking?
 
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USAFRet

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This is why you don't let other people do this for you.
 
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zenonithus

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Hey all. So I got another CPU and still the same issue. I took the pc to a repair guy and he tested all the parts saying everything works so must be the motherboard (though dont think he tested it) his conclusion is the mobo. So what do you think? What caused the mobo to suddenly bootloop? was it me resetting to optimised defaults in BIOS?
 
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zenonithus

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This is an interesting read in regards to me reverting back to optimised defaults in BIOS and then bootloop:

'I experienced the exact same issue with the new board as I did the old and it got me thinking, maybe the GA-X58A-UD3R has reverted to the backup BIOS which is a version that is prior to supporting the i7-930 chip, which from the GA-X58A-UD3R CPU support list was supported from BIOS FF on-wards.'

So could I have reverted back to an older version of the bios that doesn't support my CPU? if so is the only way to update the BIOS is to install a much older CPU model?
 
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HEXiT

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turn the pc off at the front of the case... now press the clr cmos tab(button) on the back by all the cables. just hold it in for 1 second
turn the pc on..
this will clear the cmos and reset the system to the default.

loading optimised defaults wouldnt revert your bios flash update.
clearing the cmos wont revert back to an older bios version.
you can only revert by flashing back the same way as you updated it with q-flash or the @bios flash

 
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HEXiT

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in that case if you have tested everything. did you pull the ram? and plugged it back into the same slots?
if you dont plug it into the correct slots you will get a boot loop...

so pull the ram and just test with 1 stick... if it boots then put another stick in the correct slot for dual channel... then the 3rd again in the correct slot for triple channel. (your motherboard manual has the correct slot configs and can be found on the gigabyte ud3 support tab)
 
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zenonithus

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Yep tried the RAM, I put a stick each and still not making a difference. Also the repair shop said they tested the ram. I think I will need to get a new motherboard. Can they easily just go out like that? I don't think I will ever overclock a PC again, too risky.
 
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