This is a persistent problem on my Packard Bell DV100 PC. I have not made any recent hardware or software changes. It shuts down unexpectedly, then when I turn it on it turns off immediately (doesn't even last a second). Oh, and if you need it, the ref. code is UTOW-D10. This has happened before and usually lasts 3 days or so before the computer mysteriously starts to work again. I've had it for a year. Running Vista. No computer geek language please!!!