Screen turns black/white

Hello,
I have a problem with my Acer 5920G;
It shut down and when I started it again the screen seems to be split in two - a white section, and a black section, and vertical lines start appearing.

I tried an advise I found:
Unplug the power, remove the battery and then hold the power button for 30 to 60 seconds. Then reattach the power and attempt a boot. It worked for me! Just shutdown, put the battery back in.

And this worked for me, but after 2 days the problem came back and now it do not work to do this.
Any suggestions?
Thanks.