For some reason, I can't use a USB mouse with APM enabled.
The mouse is an IBM model:MO27FO. The mobo is an A7N266-VM nforce2 using the usb-ohci driver. I was unable to boot at all with kernel 2.4.22-1.2115.nptl. After I ran up2date and my kernel was updated to 2.4.22-1.2149.nptl, I was able to boot but then the keyboard wouldn't work if I had the USB mouse plugged in. Both kernels worked fine with a PS/2 mouse. Both kernels also work fine with the USB mouse with the apm=off kernel parameter added to the grub.conf file.