Robert,
Did you drain the power from the projector for about 5 minutes? If so, have you tried another power supply or tried plugging the projector to another outlet? If so, we generally replace these units if they are still under warranty. Please contact Technical Support via the web form on the knowledge base at www.prometheankb.com, select your region/language, Projectors, Contact Us. In the Existing case field input case number: 252140 and provide the serial number of the projector.
Thanks!