HP tx2500 tablet blank screen problem

Hi Guys,

could you know anyone that can help with my blank screen problem?
I have an hp tx 2500 tablet running on windows 7. i guess the problem started the first time i connected it to tv via VGA.
Days later, the screen would go blank on start up and would have to use the F8 and F10 keys to restore it.
I thought the BIOS was outdated so I updated from F.05 to F.OF.
When I change the resolution from High performance to Balanced Performance - or vv - the screen goes blank most of the time. Switching from one user to the next also brings up the same issue.
Sometimes I have to do 10 restarts to see what I am doing. I dont think its an ATI radeon problem cause i just got an update from manufacturer.
I suspect there is a conflict that was created the first time I connected it to an external display as it hasnt been behaving as it should since then.

Many thanks in adv.
 
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