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Old 12-26-2005, 02:20 PM   #1
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CPU fan failure!

On my Son's new comp (I built for him) I am receiving an 'CPU fan failure' at start up. however it seems to be running fine, it's been running for about 35 hours now and the Fan temp is at 40C and the fan speed is at 2600rpm (isnt that kinda slow?) And the case temp is 32C.
As suggested by 'Panama Red' I looked in the bios for a way to correct or switch off the warning, but did'nt find anything except dissabling the F1 option and continuing start up after the error posts and the 3 beeps.
I left the side panel off to see the CPU fan and it spins at start up ok

specs: Asus P4S800D-X
3.0E P4 FSB 800
1G 2700 DDR
400watt PowerMax ATX PSU
80G WD ide HDD
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Last edited by ScoJan; 12-26-2005 at 02:28 PM.
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Old 12-26-2005, 02:35 PM   #2
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Are you using stock cooling?
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Old 12-26-2005, 02:41 PM   #3
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Yes, Im using the HS and fan that came with the CPU.
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Old 12-26-2005, 02:57 PM   #4
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Does the CPU heatsink fan have a 3 pin or 4 pin power connector? Try looking through the motherboard manual to see if there is a jumper on the motherboard that needs to be set for the type of heatsink fan power connection you have.

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Old 12-26-2005, 03:39 PM   #5
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That means nothing really, it just means that because your computer was turned off it had cooled down a lot, so when you boot up the fan recognizes the cool temperatures of the CPU and doesn't spin very fast. In BIOS you selected a minimum speed at which the fan would be at and a notice "CPU fan Failure" would appear.... so because it is cool in the case your fan runs slower than the minimum (defualt is kinda high) and you get the message. You can enter BIOS and lower the settings... I think it is under hardware monitor.

Or - Turn off cool and quiet settings so the fan spins full speed all the time - it is a little noisier but keeps it cool and you shouldn't get the warning.
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Old 12-26-2005, 11:57 PM   #6
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You're right, I lowered the settings in the mobo utilities console and 'no more warning'! thanks for the tip.
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