My Kindle 2 screen is really messed up, how do I fix it?

I had a Kindle for about 6 months and then randomly the upper right screen become like frozen with the screen saver image on it when I would wake it up and there was a bunch of distortion and weird lines. So I figured I'd dropped it or accidentally hit it or something. Called Amazon, got a new one, no big deal. Now I've had this one (still a Kindle 2) for only a few weeks and it's doing the EXACT same thing. I've taken great care of it, so what is going on!? I've tried holding the switch over for 20 seconds to reboot it, and something happened but I couldn't tell what because the screen is so messed up, and my Kindle is still on anyways. Anyone know what is going on?