If the blue lines are on the entire screen, and not just the video portion of it, it could be something called "chip creep" - when heating up and cooling down causes the components inside the laptop to expand and contract accordingly, and some of the boards wiggle out of their slots on the motherboard. This happens more on laptops because everything is so snug together.

I posted that because I hadn't read it yet. If it's just the video portion, then you've been given lots of great advice thus far. I'm A+ and Net+ certified, so I'll do what I can to help.
Zwitter Reviewed by Zwitter on . Laptop problems Well at the moment i only have a laptop and its only a 30GB one has i haven't bought an external hard drive for it yet. I have a problem with it, whenever i am say for example watching a video on youtube or on here, and have windows media player open or something it would just crash.. just freeze the screen would just freeze and stay the same but have weird blue lines going down it sometimes as if it were a crappy quality picture.. I have no idea why this is happening could this be Rating: 5