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How/did my motherboard die?

post #1 of 17
Thread Starter 
Salutations fellow computer builders,

I've been reading here for awhile, but I figure it's time to get a bit more involved. I was in the process of overclocking my i5-750 with a Gigabyte GA-P55M-UD2 motherboard, when the motherboard seems to have died. I was at 3.2 GHz, (160MHz x 20) with the memory timing at just 8 so that it was clocked at 1280 MHz instead of its default 1333. I just got a new CPU cooler,so I figured it was finally time to open up the true power of this overclockable CPU. IntelBurnTest was at its 'very high' setting, and it was nearly done with the third of 3 stress tests when my wonderful computer just turned off on its own, and didn't turn back on. According to RealTemp, the temperature across all 4 cores was at only 60°C or so, so I don't think it could be damaged. I tried disconnecting the motherboard's power and taking out the capacitor for a few minutes to reset the BIOS, but that didn't seem to do anything. I used the paper clip test on the power supply and confirmed that it was still working fine. This leaves me to believe it was the motherboard that got overloaded or something.

How here's the interesting part, I had tried overclocking before, and when I hit 3.2 GHz, the same thing happened. Then, I took it to a computer repair guy and he connected a 1000W power supply to it, he heard a 'pop' as it turned on magically, connected the old 450W supply again, and it still booted. I assumed then that the CPU overheated (was using the stock cooler back then) so I figured that if I got a new cooler, all would be fine......... apparently not. I've ordered a new LGA 1156 mobo from ebay, but I'd like any thoughts before I make my payment later today. Should I perhaps forget the 750 and upgrade to Ivy Bridge while I'm getting a new mobo anyway?
post #2 of 17

I think I would try connecting it to a different power supply and see what happens, I have had 2 power supplies in the past that would turn on with a paper clip and would run a single fan but would not power up the mobo

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Problem Child
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TROUBLEMAKER
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post #3 of 17
Thread Starter 
Alright, I bought a new bronze 80 rated power supply, did the paper clip test on it as well, it passed, and it failed as well. At this point I'm pretty sure it's the motherboard that's fried. Even shorting out the power switch connector didn't work. TO EBAY!!
post #4 of 17
Thread Starter 
Ok, so I decided to start messing with it again, and while doing so, I took out the processor and put it back in again, then shorted out the power switch pins, and it started fine after that. I put the BIOS settings back to default, as the overclock seems to be what caused it. Anyone smart enough to offer an explanation? I'd like to overclock, but it'd be nice if I don't fry my motherboard in the process.

Edit: By the way, I lost the bid I had on the new mobo, so this is with the old one that was seemingly obliterated.
post #5 of 17
when you say capacitor, you mean battery right lol.

Does that motherboard have a jumper pin for the bios? Mine has a little jumper that I can move over and reset the bios. Always unplug the system from the wall, move the jumper to the reset position for 10 sec (if it has one ) or remove the battery for a minute or so. Then set everything back and try re-booting.


(looked at your mobo manual, you have a jumper to clear it)

It looks like there's a 2 pin jumper slightly above your USB header pins near the bottom. Unplug the system and use a screwdriver or jumper to short the pins for a few seconds. that will properly clear the cmos.
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post #6 of 17
Thread Starter 
Yeah, I did mean the battery. I hear it called both. When I removed the battery for a few minutes, nothing happened, but when I took out the processor, it finally started again. Feels silly knowing there were those two pins staring me in the face the whole time. Guess I didn't go over the manual thoroughly enough.

While this does help for future attempts, that still doesn't explain why the motherboard seemed to have failed at a modest 3.2 GHz overclock on my i5-750...
post #7 of 17
never call it a capacitor. I don't know why anyone would call it such as a capacitor function is completely different from a battery.

anyways, I don't know exactly why it failed, but it could be that your 450 watt psu isn't strong enough? what sort of gpu are you running?
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post #8 of 17
Thread Starter 
Ok, battery it is then. I've got a Sapphire Radeon HD 6850. In trying to fix the thing, I already bought a 500W PSU, thus giving me a little more headroom.
post #9 of 17
Quote:
Originally Posted by Admiral Fear View Post

Ok, battery it is then. I've got a Sapphire Radeon HD 6850. In trying to fix the thing, I already bought a 500W PSU, thus giving me a little more headroom.

ehh the 6850 recommends a 500 watt psu with a 40amp rated 12v rail.

I would've gone for a 600-650 watt powersupply.

When it comes to choosing a PSU, always get the highest rated, highest quality you can possibly buy.

My system pulls 400-450 watts, but I've got an 850 watt powersupply. And for good reason. PSU efficiency peaks around 50% load.

(that's with my sig rig)

from the sounds of it you were probably being limited by the PSU, and you might still be pushing the one you bought as well
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post #10 of 17
Quote:
Originally Posted by Nenkitsune View Post

ehh the 6850 recommends a 500 watt psu with a 40amp rated 12v rail.

I would've gone for a 600-650 watt powersupply.

When it comes to choosing a PSU, always get the highest rated, highest quality you can possibly buy.

My system pulls 400-450 watts, but I've got an 850 watt powersupply. And for good reason. PSU efficiency peaks around 50% load.

(that's with my sig rig)

from the sounds of it you were probably being limited by the PSU, and you might still be pushing the one you bought as well

a quality 450w will run his rig just fine
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