I have an HP nc6400. Whenever I put it to sleep, it immediately reboots. Same thing on shutdown (ie: if I select Start->Shutdown it shuts down but...) it immediately starts booting again.
The only way I can keep it shut down is to do a normal shutdown, then when it starts to reboot I hold down the power button for about 5 seconds until it goes off, then keep holding it about 3 more seconds. Any variation from that process and it boots up again.
Could it be some setting messed up or is this likely a hardware problem?
--EDIT-- When I have the Power Options control panel set so for "When I close the lid..." to "Stand by", then when I actually close the lid it immediately reboots without going thru the shutdown process. That's a bad thing since it doesn't give XP any chance to flush buffers but fortunately it hasn't corrupted my HDD. This used to work fine, but not anymore.
