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There are a few things that could be causing this to happen. The first thing you should do is check all the speaker wires connected to see if they might be touching each other somewhere. What you are describing sounds like there might be a short. Also, is the receiver well ventilated? What is happening is that it is protecting itself but shutting off.The 590 is going in to Protection Mode due to some fault it perceives. The quick flashing red power light (as opposed to a slower flashing light) would indicate either speaker wires touching another terminal, driving 4 ohm speakers to loud, or amp failure.
Please see the link below for an explanation of Protect mode. Specific to your model, the output transistors are likely to be shorted. This particular model will shutdown the entire unit if any of the channels have a problem. Without actually seeing the unit and taking some internal measurements, I cannot state for sure the parts required for repair. I would expect a parts cost in the $20-$40 range minimum.
HI , just found your post . I also have just picked up a denon DAP-2500 pre and 2 POA 4400 amps with klipsch belles, having same probs with power balance i followed some helpfull advise and deoxidized all rca jacks speaker terminals ect. also i opened the pre amp and cleand it even though it was fairly clean, i used cleaner on all switches and volume controll's . WOW I could hear it nice and clean . Next i will clean the amps. hope this works for you as this is great equpment well worth saving.
Protect mode can not be "reset". This mode means that a problem was detected in the final amp stage and the unit has been shutdown to prevent further damage. The most common cause of this is failed output transistors. Plan on a parts cost in the $20-$20 range for this repair.
The protection circuit is most likely shutting down the amp because of heat. When the amp shuts down, does it feel hot? If not, then further investigation into the protection circuit will be necessary. This is not a problem that is likely to be diagnosed remotely as measurements will be required internally once the amp has stopped working. Check the sepaker wires for shorts that will cause the amp to work extra hard (generating extra heat). Other than that, you will need a servicer to diagnose further.
Protection means that the output stage of the amp has detected a problem. Usually this is because there is DC present on the speaker line indicating blown outputs. Figure on $25-$45 for parts plus the local labor rate for the repair.