I have an HP Pavilion Entertainment with Vista. When I pressed the power button, the first boot screen came up (black with the HP logo), like it's supposed to do. However, it stayed at this screen for five minutes at which point I held down the power button and then tried again. The same thing happened two more times. Then I turned it off for a few minutes and made sure it had enough air and moved it to another location. And then it worked. It's ok now, but I'm a little worried the next time I won't be so lucky. Anyone familiar with this problem? Should I be worried?