Computer will attempt to boot, then turn off

September 8, 2011 at 14:37:55
Specs: Windows 7, AMD Phenom 64 9850
I'm having a problem & have really only just learned bits & bobs on computer building & have successfully done so for a couple of years but I am practically hopeless. So please, please, be kind.

I'm running...
AMD Phenom 64 9850 X4 processor black edition (I honestly don't know if that's important,)
Biostar A780L Socket AM2+ AMD 760G motherboard
8gb ddr2 ram
Noctua NH-D14 heatsink & fan (which is stupidly large)
Antec 900 case
1 hard drive & dvd drive currently just to get it up & running again. Old motherboard had some burned out components on the exactly the same model slots, next to the processor socket directly opposite from the RAM...
So now, on the new set up, we're looking at fans everywhere... Why, when I boot up, even to do a fresh install, does it start off ok then do a countdown saying "system overheat" then turn off?
I've put the bare minimum of thermal paste (grain of rice size) that came with the fan on the cpu & attached the heatsink correctly. The design of this heatsink & big dual fan actually really locks on to the cpu allowing anything that would be considered excess to squidge out the sides anyway, even with such a small amount.

Any thoughts at all? & again as I said, I'm only really a little bit aware of what I'm doing. No overclocking or anything I'm just trying to not have an overheating system. Is there a glaring oversight?

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September 8, 2011 at 16:05:18

I see that case has a bottom mounted psu. Here's an article explaining why that's not a good idea.

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September 8, 2011 at 21:32:39
I do not think that the OP has had the system up long enough for a bottom mounted PS to matter yet, besides I accidentally ended up with one of those cases and even though it is that configuration I am running reasonable temperatures overclocked (E8200 @3.2GHz with cores right now at 45C and no AC in room). So while it is not the best possible place to put something as warm as the PS at the bottom, it is not the immediate kiss of death either.

I feel that your overheating is connected to the installation of the heat sink. Make sure both fans (the one I saw showed 2 fans) are blowing in the same direction, not at each other or away from each other. Try cleaning the mating surfaces again and resetting again with new compound again, but make sure all hold downs are tightened evenly going to opposite corners so as not to put pressure unevenly to one side for better contact. If this heat sink has exposed heat tubes on the bottom mating surface then spread a small amount of compound across the surface with an old credit card and then using the same credit card scrape off all you can in a single swipe leaving only compound filling in the small grooves where the pipes meet the rest of the base, then apply the correct amount to the CPU and mount it.

You have to be a little bit crazy to keep you from going insane.

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