error: system fan failed, service immediately

April 9, 2011 at 15:47:30
Specs: Windows XP Home Ed, 2.7ghz celeron processor/512 sdram
System will shut down in 5 seconds.

Opened the case, blew it out completely, both the CPU fan and the power supply fan are spinning fine. Boot to BIOS - CPU Fan Speed = 1700+rpm; System Fan Speed = 0rpm; CPU Temperature = 44C/111F
Pulled and reseated every plug. Visually checked Capacitors for bulges or ooze. Visually checked Mobo for heat damage. Pulled the CPU fan, heat paste looks good, soft, not crackled. Tried to set the Sys Fan Speed option to change.

Help? Thanks, Kate

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April 9, 2011 at 16:12:35
If I am not mistaken, the system fan is the fan located at the back of the tower which provides most of the air circulation through the computer, so even though the CPU fan (the fan directly over the processor) maybe working, the computer is still not receiving what it believes to be a proper amount of cooling on other system peripherals.

Are all the other fans located inside the case working? Even with variable speed fan set ups, the processor fan and the main system fan should always be working at some speed. If not, then you may need to replace the rear-facing system fan. Luckily, they're cheap and much easier to fix that a burnt up motherboard.

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April 9, 2011 at 16:37:42
Wow, thank you for the quick response. There are only two fans in the case, the CPU Fan and the Power Supply Fan which does face the back of the case. Both seem to be fine. I'm baffled!

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April 9, 2011 at 17:27:03
I think I found the problem. More to follow.

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