The P4's have a thermal protection scheme. The slow down to prevent the
frying of the processors. They will run, but very slow. The heatsink may be
just enough to keep it from shutting down, but not enough to keep it cool.

--

Dustin Harper

http://www.vistarip.com | Vista Resource & Information Page

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"Rick Rogers" wrote in message
...
Were that the case either the motherboard would detect the processor
overheating and shut down the system, or processor would fry rather
quickly.

I'd recheck for any loose cabling or memory that was jarred during the
cleaning.

--
Best of Luck,

Rick Rogers, aka "Nutcase" - Microsoft MVP
http://mvp.support.microsoft.com/
Windows help - www.rickrogers.org
My thoughts http://rick-mvp.blogspot.com

"propman" wrote in message
news:EF1_j.4780$KB3.430@edtnps91...
Dustin Harper wrote:
Did you remove the heatsink to clean the fan? If so, you may check to
make sure it is seated against the CPU perfect, as well as put a new
layer of thermal grease on it, too. The P4's slow down when they get too
hot, and after cleaning the fan, it sounds like that may be the problem.



or the power to the fan is not connected......