Have any of you encountered this problem? I got back from vacation (during which everything was unplugged), and when I got back and tried to turn on the Denon AVR-3300 receiver, it does the following. The unit's panel turns on and scrolls through the usual "Digital AV Surround Receiver" and then immediately shuts off, followed by "rapid flashing" of the red LED power indicator. All of this takes about 3 seconds. I've read through the manual, and the troubleshoot section says that this could be due to overheating or to shorting of the speakers. But this happens every time, even when the unit is cold, so I don't see how it could be the overheating. It also happens with all speakers unplugged, so no possibility of an external short. Clearly there is some sort of power issue, but the unit is getting power (the power LED is lit, etc.). The manual also mentions something about re-initializing the microprocessor, in a different section...would this do anything to help, or does it just reset all user-defined features to default? I've emailed the Denon support, but no word yet, so any insights would be appreciated.