Hello everybody I have an xbox 360 slim here and it has had the "open tray error" for a long time. I decided to fix this and bought a new laser. I installed the laser and it still gave me the "open tray error". I thought maybe just a bad laser but I bought another one and I am having the same problem. I remembered that you can get the error if your rails are out of line where the laser sits so I started adjusting the screws to adjust the height of the rails and now my lasers do not shine red. This is happening because I have messed up the height of the rails. Can somebody please tell me how to calibrate the position of the rails. Thank you very much!