Satellite P300 - blank screen since turned on, but sometimes working fine

Helo,
I have a Toshiba Satellite P300-1F0.
The display is blank when I turn it on, even on the boot up screen, and I cant hear the startup windows sounds.
Although if I turn it on and off, it will work after some tries, sometimes it works on the first try, some others I have to turn it on and off like 20 times before he finaly starts working. When it turns on it works perfectly.
I tried:
pressing the power button for 1 min while charger and battery out,
Checking manually the ram.
reinstalling and updating monitor and graphics card drivers.
shaking the lid to check if there is a cable broken
but none of these actions worked
I also noticed that the computer works with a external monitor (TV) connected via hdmi.
If i turn the laptop on, the screen is blank, and no windows sounds played, and after some minutes I plug in the hdmi cable, the Tv shows that windows was on, and sounds start to work from there.
While connected to the TV, I try to turn the display on by pressing (windws key+P) but it doesnt work.
In Screen resolution menu, windows cant detect the display, only the TV
Can anyone help me? what can be thr source of the problem?
Any soluction?
Thank you for your Time,
Adriano

As I can see you have started two identical threads. The second one is non http://forums.computers.toshiba-europe.com/forums/message.jspa?messageID=287272
Please continue discussion on first thread.

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