Hello. I have a Samsung HL-R5078W 50 inch DLP set. It works fine except that if you've had it on for an hour or more, if you try to turn it off and back on immediately, you hear a loud sound like a wheel is spinning really fast. It does this about three times, then the set shuts off, then tries to turn itself back on. It then goes through that same cycle. If I leave it unplugged for about 30 minutes, the TV will power back up properly. Could someone tell me what is wrong with my TV and what part I would need to fix it? Is it a heat issue to where when the heat dissipates, the TV can then come back on again? The TV is on a stand about a foot away from the wall, so I don't believe it to be a heat issue. Other than this, I love my DLP. Thanks.