hi, i have an ibm thinkpad a21m that was put together (mobo, hd, ram, cd, floppy, etc.). installed xp. worked fine. it had "unknown device" on device manager. i used msinfo32 to identify that it needed acpi (advanced configuration power interface). i installed it. the unknown device error went away. when i restarted the system, it keeps going into hybernation after 2-3 minutes. i unplugged cmos and main battery. reset hybernation option to never, reset all the bios to default. still goes into hybernation. my question is: would it go into hybernation if the cpu gets hot? or is there another problem that i'm overlooking? thanks.