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MoBo wont post when cpu fan is attached

This is a discussion on MoBo wont post when cpu fan is attached within the Motherboards, Bios|UEFI & CPU forums, part of the Tech Support Forum category. The BIOS boots normally when I don't have a cooling fan on the CPU, but when I mount the fan


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Old 12-21-2007, 11:25 AM   #1
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The BIOS boots normally when I don't have a cooling fan on the CPU, but when I mount the fan (LGA 775 CPU) on the CPU and turn on the power, all that happens is my fans and peripherals start. No posting from the MoBo and no video signal out to the monitor. I know the problem isn't with my one cooling fan, because I also tried the other fan that came with my CPU to no effect. I'm wondering if something is causing a short on my motherboard, though I'm not sure of this because when I first attached the fan that came with my CPU I had no problem booting. The problem only appeared when I finished installing the new fan.

This is a BYOPC I just got online, using a ECS G33T-M2 MoBo, an Intel Core 2 Quad CPU, and a Thermaltake mini typhoon for a cooling fan.

Any help on this would be much appreciated.

Thanks, Exodus
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Old 12-21-2007, 07:31 PM   #2
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Thats a strange one, I would try this

https://www.techsupportforum.com/f255/how-to-bench-test-your-system-171424.html

If it still does this I would say something is wacky with the motherboard
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Old 12-21-2007, 08:42 PM   #3
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Followed this to the first boot and encountered the same problem... I guess I'll have to replace the MoBo unless someone else here has another solution
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Old 12-21-2007, 10:22 PM   #4
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What happens if you plug in another fan to the CPU power connector?
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Old 12-21-2007, 10:32 PM   #5
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The same thing happens when i use the stock fan that came with the cpu. It has nothing to do with the fan power connector because even when its unplugged I still get the same problem. The M/B only posts if the heatsink isn't in contact with the cpu.
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Old 12-22-2007, 07:20 AM   #6
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Quote:
The M/B only posts if the heatsink isn't in contact with the cpu
Are you saying you ran this sytem without the heatsink attached? Do not do that again it could ruin the cpu, I have seen reports that the core2 duo can survive this, lets hope so.

This is a defiant short some where, with the computer on the bench as in the artical by linderman remove the cpu, clean the heatsink and cpu with the strongest percent isopropyl alcohol you can find.

Reinstall the cpu following the instructions that came with the cpu/motherboard.

Then apply thermal paste, artic silver5 preferably, following these instructions.

https://www.arcticsilver.com/instructions.htm

I am having you do this because sometimes if you overapply the thermal paste it can cause a short. After you do this start the computer in a minimal config as explained in the bench test and see if it will post
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Old 12-22-2007, 04:17 PM   #7
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Sounds like you may have a polarity problem with the fan. Check your fan wires to see if the ground wire is in the right pin. Make sure you are plugging the fan into the correct plug. You might also try connecting the fan to the main wire harness instead of the board.
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