I reinstalled Windows XP in my Compaq Presario V2000, and now the "standby" and "hibernate" options are no longer available. I tried scanning for new hardware, to no avail. In Device Manager, there is no listing for Advanced Power Management. I also checked in the BIOS options, but there is nothing helpful there. What else can I do to get this functionality back?
EDIT: Problem solved. It turns out that the mobo had been replaced, and it was actually a different model that required other drivers.