The only "mildly savvy" thing I might suggest is trying to reseat the lamp.
There's a great video tutorial available on the Samsung.com website located here: http://tinyurl.com/bxkza7 We just put those up last week (and no, guys, that's not me in the video).
If the reseat doesn't fix the problem, you might want to have a service tech come out and inspect or repair the unit.
Hope that helps!
I hope you can help me. I own a 56" Samsung DLP TV Model Number HL56A650C1F. I fell asleep last night watching TV, and when I woke up the TV was shutting down and restarting all by itself over and over again. When it shuts down, it immediately tries to restart. The chime sounds, the power light comes on, the fans all start, the lamp comes on, but then after the picture comes on, within 5 seconds, it shuts itself off, and the process starts all over again. I can't stop it from doing it. I have to unplug the TV from power just to get it to stop. When I do plug it back in, it starts all over again, and I haven't even touched a button. Is this a power supply issue, or a ballast issue? I am mildly technically savvy, and would like to see if there is anything I can do to fix this, but I would like to see where to start. Thanks for any help you can give.