Faulty cpu or heatsink, what to look for?

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KasumiONE

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Jun 4, 2013
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I have a brand new mother board, a brand new season gold rated psu and I am still facing the same issues as I was previously. The heatsink fan spins for half a second and stops, computer will not boot at all. I have isolated the motherboard on wood, removed all components and left just a stick of ram, cpu and psu and still the same unsuccessful result. I have also reset the cmos and attempted to reboot which proved unsuccessful with the same results a second time. Due to testing the cpu and heatsink on a brand new motherboard and with a brand new reputable power supply, also with and without ram, I am now focusing on the cpu being the problem. However on examination the CPU shows no signs of damage at all. The motherboard does not smell of burnt silicone and neither does the cpu. The board is all in tact with no signs of burnt damage or corrosion and especially not on the new one. Would a CPU show signs of damage necessarily if it had been "fried". What other issues with the cpu could there be? perhaps a faulty heat sink? I replaced the thermal compound, cleared the fan of all dust and this still did not improve anything. The last time that it was working, a registry update was taking place in which the computer rapidly shut down and would not restart. All components are under two years old, (asus deluxe p8z77 motherboard, WD velociraptor 1tb, 16gb corsair vengeance ram, i7 3770k processor, corsair cx 450 w psu and was recently replaced with a seasonic gold 550 w psu to narrow down the issues). Please help :( I also do not have an onboard graphics card or water cooling system. I can't seem to find anything about damaged cpu's and what to look for, and also how to test a heat sink fan independently.

Thank you for any replies
 
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nottheking
If the CPU has failed/fried, it will likely not have any visible difference to its appearance. The damage would be internal, and generally microscopic.

Overheating is not likely to be a cause of this issue, if you've replaced the thermal compound and ensured a proper connection. Even with zero passive cooling beyond the heat spreader, most CPUs would be capable of making it to POST, given they generate FAR less heat when not under heavy load. (however, the BIOS will often prohibit any attempt to boot or POST if it can't get the CPU fan turning) With the heatsink properly installed, even lacking a fan a CPU should be able to endure up to a minute or two of modest load before heat would become an issue.

As far as the cooler itself...
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nottheking

nottheking

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If the CPU has failed/fried, it will likely not have any visible difference to its appearance. The damage would be internal, and generally microscopic.

Overheating is not likely to be a cause of this issue, if you've replaced the thermal compound and ensured a proper connection. Even with zero passive cooling beyond the heat spreader, most CPUs would be capable of making it to POST, given they generate FAR less heat when not under heavy load. (however, the BIOS will often prohibit any attempt to boot or POST if it can't get the CPU fan turning) With the heatsink properly installed, even lacking a fan a CPU should be able to endure up to a minute or two of modest load before heat would become an issue.

As far as the cooler itself goes, the fans used are generally "dumb" devices; the extent of their communications are relaying their current spin rate, and receiving instructions on turning on, off, or changing speed. they tend not to have any complex circuitry that could fail on their own, in contrast to other components, so a genuinely failed fan will simply just not work.

From the sounds of what's going on, it's some sort of power control issue: every part otherwise works, but for some reason the proper signals aren't getting to and being received by the fan. It may be easiest to try testing with a different cooler, but there's a solid chance that it may not resolve the issue.

The only puzzling part is that you suggest you've replaced both the PSU and motherboard, both of which are far more liable to be at fault here. My recommendation, as well, would be to make sure you tried the CPU fan plugged into a different header first. If that's not the case, then I'd recommend trying an alternative fan.
 
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