I tried all of the different fixes for this error that I found. There was one that finnally worked for me after hours of tinkering.
You have to take the xbox apart and remove the dvd-rom. Open this as well. On the side of the laser unit there are two tiny screw looking things. The one on the left adjusts the laser hight. I had to adjust it for about an hour befor getting the exact possition. I also scratched a game with the lazer by moveing it too high so be careful and don't use your favorite game.