[https://www.ifixit.com/User/2549389/steve_barton|'''++steve_barton++'''] you’d have to start by checking the lamp and/or ballast. I would suggest that you possibly replace the lamp and check the ballast. Check the voltage to the ballast. It should be about 280V. If there is no voltage, change the power supply. Post plenty of images with your question so that we can see what you see. Use [guide|21499|this guide] for that. Careful with your ballast, it packs a punch of a couple of thousand volts on ignition. Verify your model for us so we are sure that it is a HL56A650C1FXZA