Samsung rear projection DLP HL67A750
TV set is on, blue circle is illuminated, but no picture, just black screen and the red and green light on the lower right corner are blinking, occasionally all three light blink and it sounds like the set is switching on and off. This set is 2 years old and I have already had the green LED lamp replaces, a repair just 8 months ago that cost about 25% of the original purchase price. Need help. Can I fix this economically or is this a lost cause.