Are you using LILO or GRUB as your boot loader?
If you're using GRUB, select the boot option you normally take, and press 'e' This will take you to the edit screen, find the line that says append= and add "apm=idle_threshold=100" onto the end. Then press return, then 'B' to boot the kernel with these parameters.
If your using LILO, type in "linux apm=idle_threshold=100" at the boot: prompt.
To make these changes permanant, edit the /etc/lilo.conf file as root (if you're using LILO) and add the following line in the section for the kernel you normally boot. (it will have label=linux there)
apm=idle_threshold=100
save and exit. This varies depending on the editor.
run /sbin/lilo again as root from a console.
It should list all the installed kernels and the change should take effect the next reboot.
For GRUB:
edit /boot/grub/grub.conf (it may be menu.lst, but shouldn't be)
find the append= line for your kernel and add to the end:
"apm=idle_threshold=100"
(without the quotes)
That should do the trick.
And last, but definatley not least:
WELCOME TO TECHIMO!!!