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Screen problem with HP DV 9000

\015 Hi,The screen on my HP DV9000 goes blank after about 30 seconds from boot up. The screen flashes and goes blank. If you look closely, you can see the screen faintly in the background. When i run the computer on battery power and connect to an external monitor, it works fine. As soon as i plug the power supply in, the external monitor pops up a messege saying no signal found. What do you think?\015

Answers :

I think Your computer C.P.U. power supply unit is not working properly. because these type of problem occur when Power Supply Unit is not working properly.........
\015\012
\015\012So Don't afraid at all just change your c.p.u. power supply unit with new one (it is not costly at all).
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