Is ACPI enabled in your bios? If you run Everest, does it show under Computer, Summary, Computer Type as an ACPI PC?
Everest is a download that, when run, gives LOTS of info re your OS and hardware: http://www.majorgeeks.com/download4181.html
fernie523 power schemes options problem solved.on a microsoft windows xp computer go to help & support.type in problem.they have 3 methods to solve this problem.