Sorry John, butting in here...
Romario, I had a BIOS that seemed to need an occasional "refresh".
(AS in flashing "it" to the same thing.)
I also had a BIOS that refused to flash. I had the correct file BTW.
The embedded boot block was damaged, and could not be (force) overwritten.
Just make SURE you get the right one before you try.

All the above machines became "defective" within a year after
all these "tricks"...
I'd stick with investigating the FAN a little longer.

If you can beg or borrow a different fan, I'd plug it into the PROPER
socket (the one being detected), WITH the actual installed CPU fan
plugged in elsewhere. Say the case socket? Maybe?
(It would need the same type plug, so YMMV...)
NEVER run the CPU without the installed fan ON IT spinning.
(Use a little fan extension cord if you need the extra length.)
(Maybe "breadboard" it for testing?) Watch/observe electrical polarity.

Speaking of fans, if you eventually change it, be sure to clean up the
CPU well and use new heat transfer compound of the proper type.
(Sorry if you knew that, just being thorough)

Rick Glazier

From: "Romario chipo"
> This is really intriguing. The PC has been perational for only 2 years.
> Would flashing the BIOS help?
> 
John Sproule  wrote:
clipped
>> I take it that either the BIOS does not have a hardware monitoring section
>> or the computer shuts down too quickly for you to have a chance to see what
>> the motherboard's monitoring function might have to say about the CPU fan's
>> rpm/speed.

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