Our third Q &
A of the week comes from Percival via the PCstats reader feedback page
. If you have a question you need answered right
away, try our friendly forums for help.
Q: What should I do? I unwittingly
(experimentally) enabled the cpu fan "detect cpu fan speed" from the default
setting "disabled/off" to the "enable/on" mode on my motherboard; it does say
that in the event that fan speed detected is abnormal, that there will be a
short beep and the cpu will halt. On my system running an athlon 750 MHz, it did
exactly just that and now I am locked out completely from the cmos setup.
I can't find a jumper to return the CMOS to its default setting. If I power-on
the system, it just beeps accordingly and shuts off. What should I
The most likely problem here is that your
CPU heatsink fan is running at a speed (RPM) that your
motherboard considers dangerous. This does not mean that the fan is actually defective, since
many newer heatsinks
with larger fans spin at a slower rate yet move as much
if not more air than their smaller equivalents. It sounds like you are
using an older motherboard which may not recognize these speeds
as valid, especially since it was probably designed for Athlon/Athlon XP+ processors
which run extremely hot.
The best thing
you can do
in this situation is to remove the CMOS battery (the small silver
disk) from your powered off computer with a pen or other implement and
wait for about 10-15 minutes before putting it back. This
should reset your BIOS (and the 'detect CPU fan speed' value) back
to the default values.