Hello, I have a query.  My husband bought me a Hp cpu back several months ago.  It worked fine althought I would rather have xp than Vista... But lately, I will be working on my computer and it just shuts down.. all by itself...
Has anyone encountered this and does anyone know what might be the problem? Like yesterday it happened 3 times... It comes back on when I hit the reset button on the cpu, but why did it do it to begin with and getting more often?  
You can write me at bjhopkins@verizon.net
Thank You, Best Regards and Happy Thanksgiving..
Betty in Va.

That sounds like a bad power supply.  The best way to figure out whether it is the power supply or not is to replace it with a new power supply.

Actually the best thing to do, if the pc is only a few months old, is to contact HP service.

If still under warranty HP might void that warranty if you mess with the PC.