Does CPU fan on Pentium II need to rotate for boot?

External Since: Aug 19, 2003 Posts: 3

Have a mother board that is driving me batty - has a Pentium II and
after it has sat idle for a while it will not boot - no display no
bios display the fan on the CPU does not spin up - If I let it sit
powered up for a while - then turn off the unit, unseat the CPU
(Pentium II with attached fan ) - then re-seat the Pentium and turn
back the power it will boot properly - fan on heat sink rotates, and
display will come up, etc.
Any ideas?
CMOS battery reads 2.8 volts - should be 3.0 and date and time are
kept OK - may just try a new battery.

External Since: Aug 02, 2003 Posts: 10

The motherboard may have a fam monitor feature.
If it sees that the CPU fan is not spinning then it thinks that it has
failed and stops the system booting as a safety feature.

Get a replacement CPU or fan.
You could try looking in the bios when the system does boot and see if there
is an option to switch the feature off.
You may not find this option though.

"hal" <nospamhals.DeleteThis@ix.netcom.com> wrote in message
news:3f42b376.1326231@news.east.earthlink.net...
> Have a mother board that is driving me batty - has a Pentium II and
> after it has sat idle for a while it will not boot - no display no
> bios display the fan on the CPU does not spin up - If I let it sit
> powered up for a while - then turn off the unit, unseat the CPU
> (Pentium II with attached fan ) - then re-seat the Pentium and turn
> back the power it will boot properly - fan on heat sink rotates, and
> display will come up, etc.
> Any ideas?
> CMOS battery reads 2.8 volts - should be 3.0 and date and time are
> kept OK - may just try a new battery.