Gateway laptop shuts down after proceesor upgrade

pilla

Junior Member
Jan 28, 2006
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I have a Gateway 4025GZ;couple of days back replaced the celeron m processor 1.4ghz (Dothan) with a Pentium M 1.6ghz processor.
After the change the machine is shutting down by itself. I work for about 15mins and the machine just shuts down, put back the original processor and everything is normal.
Checked the fan, it's clean not much dust...

Is there a CPU temperature setting that I should change, if so where? I looked in the BIOS but could not find anything.
With the Pentium M in the fan is a bit louder too...
Thanks