Home Theater Questions? Ask a Technician for Answers ASAP
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The flashing light indicates that the unit has gone into a Protection mode.
There are a number of things that could cause this.
You want to make sure you have at least six inches of clearance between the top of the receiver and any other device or shelf. You also want to watch your volume to make sure you are keeping it below "0 dB" on a consistent basis.
Also, confirm that you have no speaker wire exposed that may touch either another speaker wire or the chassis of the receiver. Please make sure that the unit is receiving the proper voltage and that you are not incurring any voltage fluctuations that would trip the protection circuitry.
You can try to resolve the issue by removing all the speakers from the unit and if the unit comes out of Protection then add the speakers back one by one until you're able to determine which speaker is causing the electrical short in the speaker terminal. You can also try resetting the unit's microprocessor in the event a logic glitch in the firmware is causing the protection circuit to trip. See your owner's manual for your receiver's reset procedure.
If these procedures do not resolve the issue you will need to have the unit looked at by a service technician. You can use this link to locate the nearest Denon authorized service center: http://usa.denon.com/us/support/pages/servicecentersearch.aspx
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