I have a toshiba laptop, it's about 4 years old, had been working flawlessly until ...
Recently, the LCD screen started to show some artifacts, like flickering, screen freeze in dark image and corner starts to get brighter. Most of the flickering happens in a horizontal pattern (horizontal lines, parts)
At first, moving the screen a little bit corrected the problem.
Now, if it appears at startup, its very hard to get rid of it (the screen may get clean, but the problem reappear very fast).
But sometimes, it just works fine.
Searching in the web, I concluded this could be a screen inverter failure, but I have no idea if another piece of hardware could be responsible of this.
Please note, the problem appears even before loading the os and an external screen works correctly.
What do you think ?