NB520 - black screen when the POST and Windows 8.1

Good afternoon!

I'm in a strange problem.
My netbook screen shows black during POST (Bios) and sometimes shows a few white lines, as interference.

If I boot Windows OS 8.1 the problem persists.
If I run Ubuntu, I can see everything normally.

I looked on the connection of the screen and it touched to check the wire is ok, but is the same.
If I connect an external VGA display I can see straight.

Years, I changed the screen because it brokes.
In the last months, I could see lines on the screen especially during the POST.

It could be a screen issue, son...?
The screen does not support some frecuences now?

Thank you and sorry for my English.

My netbook is a * NB520 *.

I read the other post you created long on upgrading the CPU.
Upgrade you the processor and if yes has issued in this view appear before the replacement of the CPU?

Tags: Toshiba

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