You will need to adjust the pots for the drive, take the case of your xbox and then the top casing off the drive you will see two screw like objects at the back of the laser, you will need to twist the left one i believe but im not 100% sure.
ok well i fixed it, but i didnt use that video but thanks for helping out, it turns out that the laser wasnt starting out in the right spot so it wasnt detecting the cd, so i moved it to the right spot and got it to work