QUOTE (ilia_kr @ May 20 2007, 08:50 AM)

How can i check if my PC can handle ACPI ?
Do you know what BIOS/model you have? Maybe, send email to the manufacturer of BIOS or box?
QUOTE
First of all, i have a desktop pentium 3. Second, it seems like mandriva 2007.1 doesn't have any problem with acpi. I really don't know how that acpi thing works. Gooing to google for it now... Do you have a good link where i can learn about it?
As I said, this could be a compatibility problem with BIOS. About 3-4 years ago there was quite a bit of noise about ACPI in this and other forums. Many users complained about the poweroff problem similar to yours. I `fixed' my laptop by adding acpi=off to the kernel options, and loading apm instead. I have no problems with power management ever since. It worth trying (but I completely forgot what else I did).