I've joined the bandwagon! This thread is such a wonderful source of info! Even despite the unfortunate circumstance. And I'm keeping the thread alive!
We purchased the TV in July 2007 via Amazon. Just like everyone, blown away by its crispness and sound. By November, we got the 3 flashing lights and no picture/sound. Samsung and repair company dragged their butts, and after 3 months, they replaced the LED engine, which did the trick.
But alas, it was shortlived. Our TV died again back in July. We got the flashing LCD light and zilch. No picture, no sound. Not even the jingle. We were really fortunate in that we barely hit the 2 year warranty period. After a month of dealing with the repair shop, the repair guy gave up and they gave us a refund on our overpriced paperweight. So this is essentially a free tv (minus 1 yr extended warranty).
However, I am not ready to give up on our beloved TV/paperweight, so here I am. I blew compressed air through the fans, and let the TV cycle about a dozen times, and whatdyaknow, it comes on! I'm not sure if the air through the fans did anything but there was a lot of dust (a given after 2 years, I hope). But I do see that couple of the capacitors are bulging in the powersupply like some of the pictures that have been posted (love you guys!)
It does take about a half dozen times to cycle each time we turn on before we get any picture though, so I do think it's a matter of time before it just stops coming on altogether. We'll be taking the powersupply into a repair shop to replace the capacitors, so hopefully this does the trick.