Satellite L755D: black screen after startup or switching of external monitor

I have a strange problem with my Satellite L755D. I normally use an external monitor that works very well.

If I want to switch to the laptops monitor using Fn + F5, the laptop monitor remains dark, but you can see (more guessing) office.

Just the bright background lights. Same thing if I boot without the external monitor. In the beginning (phase BIOS?), you can see the normal symbols, then the screen turns to.

Funny, is that these two problems do not appear when I cut the power supply and the laptop runs on battery only.
Any ideas, what the reason could be?

Thank you
Mason

Funny, is that these two problems do not appear when I cut the power supply and the laptop runs on battery only.

Maybe you should check the configuration of power plan that is used only in battery mode.
It might be possible that the backlight settings have been set at a lower value by using the power of the battery.
I recommend you to check this in the ATI catalyst and windows power options.

Tags: Toshiba

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