Denon avr e400 continues to shut down when it gets turned on

SOURCE: Denon AVR-4800 5.1Channel Standby light blinking

It's going into protect. Unhook ALL the speakers and see if it still shuts itself off. If so, then it will have to be taken in for service.

SOURCE: Denon AVR-1601

This is a very common problem with denon receivers of the 2001-2-3 vintage. On almost every one, there are 4 little "surge" resistors in the power supply. These werent quite robust enough from the factory and one day would just burn open for no reason. Well, actually there is a reason, the "surge" that happens every time you power the unit up eventually weakens the resistors and then they pop. You need to take this to a denon service shop as I GUARANTEE they have seen this before. They need to check resistors in the picture, locarde above the **** rectangular connector. Resistors numbers R141, 142, 148, 149: These resistors when measured, should be less than 10 ohms each. If they are more, then they are blown. If they are blown, then have the shop check the channels for blown output transistors. If the outputs are OK, then these resistors should be replaced with 1 ohm 1/2 watt metal -film flameproof resistors. You might need to be prepared for a large bill, because the entire unit must come apart to replace the resistors, however, just checking them takes only about 10 minutes... Good luck and don't try this at home. Rob

SOURCE: My Denon AVR-887 Keeps turning itself off

My AVR-887 IS SHUTTING OFF ALSO AFTER ABOUT 30 SECONDS.

SOURCE: Denon avr-1804 its turns back after 5 sec

Disconnect all speaker wires on back and then turn on. If it happens again, it's most likely a power supply problem. If it doesn't happen again, it was probably crossed speaker wires.

SOURCE: Denon AVR-1803 keeps shutting down

I had a similar problem with my Denon receiver... I thought there might be some issue with the power source, which was a (supposedly good quality, surge protected) power strip that it was sharing with a lot of other gear.

I unplugged it from the power strip, and ran an extension cord from the next room and plugged it into that.

The switching off & on seems to have stopped.