You can move the needle case to #1 and then turn off the machine. Locate the slot for the laser on the black plastic cover on the right side, at an angle above the silver screw.
The angled slot is where the laser shines through it. It’s just to the right of the presser foot and needle bar when the needle case is on #1.
Take canned air or a compressor and blow it out. There may be dust of something clogging the path of the laser causing it not to show or show vaguely.