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CPU Fan Not Starting Right On Boot


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#1
Carl Sagan

Carl Sagan

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Hey !

I just finished building my new computer.

Motherboard is ASUS Sabertooth Z77
CPU is Intel Core i7-3770K Ivy Bridge 3.5GHz

So I booted my computer and there was this message that popped on my Desktop : Warning, CPU Fan 0 RPM

I looked in the Case, and indeed, the CPU Fan was not running. It looked to be TRYING to run, tho... It was spinning a very little bit (like, half a full spin) and then stopped... And so on.

I turned off the computer immediatly, openened the case and plugged the fan in the Optionnal CPU FAN port. When I booted, I had the CPU Fan Error (of course, since it was not connected in the primary slot anymore). I went into BIOS and like 2-3 seconds later, the CPU Fan started running...

I tried to reboot, and then the CPU Fan started running only when the computer had booted completely (when my desktop appeared)

After another reboot, it started to spin while booting, but not right after I pushed the power button

Another reboot : Didn't start to spin until desktop gave me 2 Warning messages "CPU Fan 0 RPM"

It seems to be pretty random... Could it be the fan ? or the Power Supply ? Or the Motherboard ?

Thanks ! :D
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#2
Carl Sagan

Carl Sagan

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Please ?
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#3
phillpower2

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Please provide a list of the rest of your hardware including the brand and model name or number of your PSU.

Are the heatsink and CPU fan mounted correctly, did you apply the correct amount of thermal paste to the CPU/heatsink http://www.geekstogo...rface-material/

Best couple of suggestions I can make would be first remove the MB and do a barebones set-up on a piece of cardboard (make sure it is larger than the MB) only connect the PSU, the GFX card, 1 stick of Ram and the keyboard.
IF your MB doesn`t have a power test switch you will then need to short out the 2 power on pins on the MB header to get the PSU to activate, you can use a small flat bladed screwdriver or a paper clip bent into a U shape, this is perfectly safe if you do not touch anything else, the idea is to see if we can get a BIOS screen if you do you can then add one component at a time until you find the problem component, you must power down and remove the power cord from the wall before adding a component, second suggestion try a known working PSU.

Other things worth checking include, if you used stand offs beneath the MB are they in the correct locations (only where there is a screw hole in the MB) otherwise the MB will short out, check for stray screws or bared wires for the same reason.
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