I have a gateway tablet pc that does the same thing. In my case it was a loose cable connection.
However, check the HP driver site to make sure you have all the current drivers as the rotation driver or video driver may also be the culprit.
Your other option if you are using Vista or Windows7 is to go to the mobility center in control panel and try to manually rotate the screen. If your tablet has a screen rotate button like mine, try pressing it to see waht happens.
HTH,
David
http://i99.photobucket.com/albums/l299/xz550rj/HPMagicGiveaway.jpg
Woohoo! I won my Touchsmart!

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