[ecurbh]

It sounds like a problem with the video card. I would start by downloading the latest drivers from the manufacturer's website. If you need more detailed information on how to do this, check out this website.

[Sam Cree]

Thanks guys, I will try those things. The monitor is actually 5 or 6 years old, but works fine except for the lines and bands, which are apparently not its problem anyway.

The video card, I'd say is only 2 or maybe 2 years old.