Nad 712 output issues - Mute flashing

I just got a Nad 712 off ebay. Upon initial setup, after plugging in and turing the receiver / preamp front power button to put it in standby mode, the led faintly shows a flashing mute indicator.

Once turned on, the mute indicator turns off, but the led is faint and there is no output from the stereo.

Is there a system reset for this unit? Is there a way to turn off mute without a remote? What is wrong? Should I claim DOA and try to get a refund?

Thanks!
andygwis@sbcglobal.net