Hello.
What you're seeing is a very common problem. Fortunately, there is also a very easy fix.
Open up your system, find the row of three white potentiometers, and turn the middle one 1/8 of a full rotation counterclockwise. Check and see if it works. If it doesn't, give it another 1/8 turn (you want to do this as few times as possible). If it doesn't work after it's been turned 4/8 of a full rotation, it's probably not going to work, and you'll need a new laser.
Good luck!