I just moved my sister's HP Pavilion 9900 from her room to mine and now...it won't boot. It's stuck on the HP boot screen. I really don't know what to do...it worked an hour ago just fine. But now, when I press the power button, the blue HP screen comes up and sticks. Anyone have any ideas on what I can do? I thought that clearing the BIOS or CMOS might help, but can't find any documentation on telling me how to do so.