Is this a replacement fan or did the original fan stop being detected?  If 
it is a replacement fan, does it have the same number of wires as the 
original (e.g. 3 or 4 wires) and is it plugged into the same fan header on 
the motherboard that the original fan was plugged into?  Does the BIOS have 
a hardware monitoring section, and if so, what does it indicate about the 
CPU fan's speed?

Hopefully, the answers to these questions will help diagnose what is going 
on.

John Sproule

------- Original Message Below ---------

Date:    Wed, 11 Aug 2010 14:26:12 +0300
From:    Romario chipo <[log in to unmask]>
Subject: Fan cannot be detected

I have a Compaq DX2300M that will not boot because the system detects that
the Fan is not running. In fact the fan spins and an error is posted just
after the post: Fan cannot be detected. System is shutting down to prevent
the PC from damage. I have disabled the automatic detection of fan in the
CMOS but this does not solve the problem. I even reset the CMOS battery but
to no avail.

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