I have a 3 year old HP Pavilion dv2208 laptop. Recently it started abruptly powering off in like ~20-30 seconds into Windows boot sequence after almost every reboot/shutdown. Even if I leave it in Repair/Start Windows Normally stage it powers off anyway.
The only way I managed to workaround this is to enter BIOS setup screen and leave it on for no less than 10 minutes. I don't know what happens there but this helps every time.
Any ideas of possible ways to fix this that don't include replacing motherboard are highly appreciated.
P.S.: I've tried resetting BIOS to defaults, updating to the latest BIOS version, etc. Happens with both Vista and Windows 7.