Originally posted by pdavid
If i am using the nvidia drivers, and start the machine up, the fan on the vidcard spins along happily. but the minute X starts up, the fan stops!
That's quite bizzare and sounds like a power management issue. I noticed you disabled APIC earlier. Re-enable it and instead disable ACPI and APM instead in your Linux kernel (Looks like your BIOS didn't have a menu option to toggle power management, correct?).