The same thing happened to me a few days ago. I confirmed the power supply was working, but still no lights. To make a long story short I determined that the circuit board power was shorted out. I opened it up and found that a capacitor (1C37) had shorted out, and so I removed it. This fixed the problem.
This power cap is one of many like it, and any one of them can short out due to defect or poor quality. But in most cases the offending cap can be removed and not replaced.
I have test equipment, but you can usually find a shorted power cap with your finger as it will get hot. If you are not skilled with electronics repair I recommend you return the unit as you will need skill with a soldering iron to make this repair.
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