Sandy Bridge custom build, won't boot, CPU fan not spinning

October 11, 2012 at 18:09:45
Specs: Windows 7, I7 2600
I've recently got hold of the following kit:
i7 2600
Asus p8p67LE (revision 1, I'm aware of the SATA bug)
4gb Corsair Vengeance.

The CPU and mobo were assembled a year ago and left in a box, when I finally got round to setting up a rig on it, I tried a quick boot - just with cpu & ram, and the Intel's stock cooler does half a spin and stops. All that's plugged is Mobo power, cpu power, cpu fan. I thought it may be an issue with the fan, tried reattaching it, but it didn't bring any result.
Haven't got a pc speaker in the case (yeah, thank you coolermaster :/), but I think it's a mobo/cpu issue.
The PSU is a brand new, straight out of the box CM750W.
Any ideas? Please tell me it's something obvious, I really don't feel like shelling out a few hundred quid on new mobo/cpu...


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October 11, 2012 at 20:56:09
If the motherboard are in the case, remove it and try it on cardboard with the power supply next to it and the case there just for the on/off button. This will eliminate the possibility that the motherboard is grounding out on the case because of a missing or misplaced post, dropped (lost) screw, or other things.

I do not know 100%, but I am pretty sure that your motherboard requires a stick of memory to complete powering up the CPU since even the BIOS requires system memory. I am not 100% positive simply because it never has occurred to me to testing begin bench testing without a stick of memory. If you had a case speaker, you would get a beep tone telling you that you did not have memory installed.

Do not throw in the towel yet on those components.

You have to be a little bit crazy to keep you from going insane.
---- Save Big Bird -----

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October 12, 2012 at 02:33:29
I've tried with and without memmory and outside of the case. Still notthing.

Thanks anyway.


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October 12, 2012 at 08:55:24
Either the heatsink is mounted incorrectly & it's a temp related shutdown, or the CPU fan is connected to the wrong header & no fan is being detected, or the power supply is bad (or not connected properly).

It appears CM750W is made by FSP, not Cooler Master. Does it look like this:

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Related Solutions

October 12, 2012 at 13:02:33
I also found ur power supply suspicious, it seems that i found the same link as riider but
the thing is ur psu may have the high wattage but the ratings are bad. it has 2 12 V rails which is not good. so iam beginning to suspect its a psu issue and not a board issue, a half spin of the cpu does hint at that

computers are a second home

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October 14, 2012 at 08:41:10

Thanks for all the replies.
Yesterday I took the mobo to my mate, we've plugged it to his corsair 850W, same result - at least I know that my gtx580 and RAM are fine.

@riider: I'm using a stock intel cooler - you can't mount it incorrectly, really?
So, it looks like the motherboard gave up the ghost. The fan is attached to cpu_fan pins.

Sadly, I don't know many people with socket 1155 to check the CPU - I've got one mate, but he's on holiday till next week.
I think all that's left is praying that it's only mobo, I really can't afford a new CPU. Is there anything else I can check, or could've omitted?

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October 14, 2012 at 11:26:13
You CAN install the heat sink incorrectly by not properly applying thermal paste or pad.

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October 14, 2012 at 11:34:00
Intel's stock monster comes with thermal paste pre-applied... highly unlikely in that case.
I may try cleaning it off and using a different solution, doubt it will work though.

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October 14, 2012 at 11:55:23
Don't you need to remove the plastic film before installing the heat sink?

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October 14, 2012 at 12:16:47
Plastic film from the heatsink? Nope, that can't be the case... I'll try to buy some thermal paste tomorrow, as an experiment with "stretching" tp on the cooler brought an unusual effect - the fan stops spinning after 10 seconds now :)

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October 15, 2012 at 08:27:06
Read the link below.

Also see #6 in the second link below.

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