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I can ONLY give you suggestion.... Note that most of the high power laser devices have safety interlocks to insure the beam is moving before turning laser on. Verify any dip switch settings to make sure they are in a suitable mode. If the laser comes on during test, ASSUME that a setting is wrong. I do not have this unit so my suggestion is general based on experience with other devices.
Uncover it... you will probably find that some of the LED's are not lighting. OFTEN soldering on circuit boards OR a bad LED in a string kills several like Christmas strings. More than this you need to be somewaht adept at electronics to repair it.
I have OFTEN found that a cable has come loose. Open the unit and look for such a situation. Also make sure the motion (probably a disc) is working/rotating since with high power LED devices, they have interlocks for safety to keep beams moving.
I have seen bad solder of the pins of the connector on the board with the LED's. Reflow the solder and verify there are no solder bridges. ALSO verify that the circuit traces near these pins have not been lifted or broken.
If by chance teh light is on the end of a long DMX cable run, read about putting a terminating resistor at the end of the chain. You say you are having "trouble"... that doesn't tell us anything that we could help you with.
I have repaired several effects lighting units and MANY have connectors dislodged or even the LED module knocked out of alignment or its mounting. USUALLY the problem will be obvious when you open the unit. If it happens to be an electronic problem, it probably will not be a DIY repair as there is little documentation and schematics.