I have a HLN507W. Its little over 2 years old. It has been working great and then all of a sudden last week it automatically shut off. It would not come back up at all. I tried re-connecting the power cord. No effect. When I connect the power cord All 3 LED's switch ON and stays ON and thats it. (Not blinking which would have meant bulb gone bad)I have tried re-seating the bulb too with no effect again. Any sugestions/help will be much appreciated.