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Did I fry my CPU, PSU, or Mobo?

post #1 of 15
Thread Starter 
Hello, so I accidentally my computer going for 4.2GHz. No magic blue smoke, no burnt chip smell, no burnt visible areas

My computer no longer starts up and after some trial and error, I have brought down the culprit to either the PSU (4th rail), CPU, or motherboard.

This is what happens when I try to turn it on, if the 4th rail is not connected (CPU rail/power) to the motherboard, the computer turns on like normal and the mobo waits for CPU initialization (FF), everything powers on (fans, hard drives, water pump, etc.). Now if I try to turn it on with the CPU power plugged in, the mobo flashes its blue LEDs and then turns off (almost instantly as I turn it on). If I try to turn it on again, nothing happens, if I want the mobo to "turn on" again, I have to remove the power cord, turn the PSU on and off, and plug it back in.

I don't have other equipment to test my hardware on so this is why I'm asking for help. Here is what I think what could've gone wrong:

CPU: 1.5V fried it...

Mobo: The VRMs/Mosfets are known to blow up at 1.5V+ (but the heatsink was adequately cooled keeping the VRMs below 46C). I checked behind the mobo and all soldering joints are still intact and shiny.

PSU: The PSU provides 20A to each rail (4 rails total). CPU was asking too much and passed the 20A limit, frying the 4th rail.

Hopefully it's the PSU, as I'd like to buy a Ultra X3 1000W..

What do you guys think?
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post #2 of 15
Doubt its the cpu, ive never heard of a thuban going at 1.5v especially under a custom WC loop, just my 2 cents. And i dont think pulling more than 20amps from 1 rail is enough to fry the whole thing. Most PSU's fry after the total power draw exceeds what they can supply.
    
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post #3 of 15
Quote:
Originally Posted by codejunki View Post
Doubt its the cpu, ive never heard of a thuban going at 1.5v especially under a custom WC loop, just my 2 cents. And i dont think pulling more than 20amps from 1 rail is enough to fry the whole thing. Most PSU's fry after the total power draw exceeds what they can supply.
i second this. Do you got a spare cpu/psu u can test it with? Did u reset CMOS?
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post #4 of 15
Thread Starter 
Quote:
Originally Posted by 1337LutZ View Post
i second this. Do you got a spare cpu/psu u can test it with? Did u reset CMOS?
No additional hardware unfortunately, and I did do a CMOS reset, didn't fix it...

I just noticed that this thread should have been posted under Components, apologies for posting it here lol.
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post #5 of 15
Quote:
Originally Posted by avattz View Post
Hello, so I accidentally my computer going for 4.2GHz. No magic blue smoke, no burnt chip smell, no burnt visible areas

My computer no longer starts up and after some trial and error, I have brought down the culprit to either the PSU (4th rail), CPU, or motherboard.

This is what happens when I try to turn it on, if the 4th rail is not connected (CPU rail/power) to the motherboard, the computer turns on like normal and the mobo waits for CPU initialization (FF), everything powers on (fans, hard drives, water pump, etc.). Now if I try to turn it on with the CPU power plugged in, the mobo flashes its blue LEDs and then turns off (almost instantly as I turn it on). If I try to turn it on again, nothing happens, if I want the mobo to "turn on" again, I have to remove the power cord, turn the PSU on and off, and plug it back in.

I don't have other equipment to test my hardware on so this is why I'm asking for help. Here is what I think what could've gone wrong:

CPU: 1.5V fried it...

Mobo: The VRMs/Mosfets are known to blow up at 1.5V+ (but the heatsink was adequately cooled keeping the VRMs below 46C). I checked behind the mobo and all soldering joints are still intact and shiny.

PSU: The PSU provides 20A to each rail (4 rails total). CPU was asking too much and passed the 20A limit, frying the 4th rail.

Hopefully it's the PSU, as I'd like to buy a Ultra X3 1000W..

What do you guys think?
take board/cpu/ram to a pc shop, most will check em for free or only charge like $30
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post #6 of 15
If everything turns ON, without the CPU power plug connected, your mobo is dead. (MOS-FETs.)
That use to happen with MSI boards.
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post #7 of 15
The reason the mosfets blow up on that is because it is a 4+1 power phase on an MSI board. Yes, under that big heatsink is a 4+1 power phase on MSI's former top-of-the-line board. 4+1 power phases can blow up even heatsinked on MSI boards. I have seen at least 3 horror stories on the MSI 890GXM-G65.
However, if there's no visible damage, chances are the mosfets are okay (usually when they fail they go out in a nice puff of smoke). I'm pretty sure going by IOSEFINI said they could probably fail otherwise (i.e. blown caps or a problem just outside the mosfets)
post #8 of 15
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
The reason the mosfets blow up on that is because it is a 4+1 power phase on an MSI board. Yes, under that big heatsink is a 4+1 power phase on MSI's former top-of-the-line board. 4+1 power phases can blow up even heatsinked on MSI boards. I have seen at least 3 horror stories on the MSI 890GXM-G65.
However, if there's no visible damage, chances are the mosfets are okay (usually when they fail they go out in a nice puff of smoke). I'm pretty sure going by IOSEFINI said they could probably fail otherwise (i.e. blown caps or a problem just outside the mosfets)
I'll take out the motherboard and take a closer look. If I remove the motherboard heatsink, does that void the warranty?
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post #9 of 15
You'll have to check with MSI's warranty policies (should be in your motherboard manual)
post #10 of 15
now it gives me a creeps 4.2??? i made my 3.2 to 3.9 when i run prime95 blue screen of death so i lower it to total of 3.6 idk how this thing fries??? the thing is in my mind as long as the Voltage stays 1.40+ it will never go wrong just blue screen of sort off right???? or im wrong...
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