If I press the little button which turns to hibernation mode the screen flickers on then off again

I have just come across your site on Toshiba notebooks/laptops etc…I have a problem with my notebook in that the screen is blank….. If I press the little button which turns to hibernation mode the screen flickers on then off again…I have no problems using external monitor…..any suggestions would be gratefully appreciated.

This little button is the lid close switch and when you press on the switch it cuts off the power from the FL inverter board. After you depress the switch, the FL inverter board gets power again and it light up the backlight bulb in the screen. Here is a generic laptop display diagram. I think that you are having a problem with the FL inverter board. This board fails often and usually when it fails, it behaves exactly as you described above. Even though you have no backlight, you still have to be able to see some data on the screen. It would be a regular image but very dim. For more troubleshooting steps check out my post about laptop video problems.

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