White screen on Tecra A2

When I turn on, the toshiba logo is illuminated as usual, but as soon as the windows logo appears, the backlight turns off. Windows continues to open as normal (I can just see him making a strong light about it). using ctrl + alt + F1, follow-up of ctrl + alt + F3 the backlight turns on for 1 second or two, then goes off again. I played with all the display settings but no luck. any ideas?

Hello

If you write on the brightness of the screen that you can change using FN + F6 and F7. Ctrl + alt + F1 key combination does not for me for a specific function of Toshiba.

Tags: Toshiba

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