Satellite Pro M40: screen stays dark untill Windows has fully loaded

Hello to all on here.
I have a problem with my laptop. My laptop is a Satellite Pro M40.
When I turn on my laptop I have found the back light will not come on... the screen will stay dark untill it has fully loaded into Windows. I have checked all of my power options and there all fine. Even if I can get to the Bios screen its impossible to read the txt due to no backlight. I have tried holding the Fn & F7.. noy joy.
Does anyone have any ideas?
Richard

Hello Richard
I didnt see something like that before and I am little bit confused why you can not see BIOS settings but running OS. Usage of FN+F7 key combination will not help because this option works just under Windows and not under DOS level.
If possible try to connect external monitor and test it again. Anyway I dont believe that you can fix it on your own. Try please to contact Toshiba authorized service partner in your country. Explain the situation and you will see what they will say.
If you find out something please let us know. It will be really interesting to know why this happen.

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