I have an HP media center PC running x64 Vista, when I usually put the PC in sleep mode (I'm assuming s3?) the case fans, PS fans and CPU fan would all cut off, now they do not. I have been reading and scanning forums all day on the subject and find no fixes. The closest thing I can come to is a registry setting? There are no power management options in BIOS(the BIOS is the most recent release, I checked).
Any suggestions appreciated!