design error in this receiver presents itself with a blinking red power light shortly after turning the unit on. the blinking light is the circuit protection detecting a short in the circuitry, the only problem is that the circuitry shouldnt be shorting out after only a few months. you will find this a common problem for this unit if you search online. Denon makes it very clear in the one year warranty that the store where you bought it (circuit city) is responsible for repair and tech support. if you are trying to fix your AVR-688, use a multimeter and check the resistance between the speaker +/- outputs (red and black) and signal inputs (check each input with every other input), along with the resistance of the components in the power board (the board that the power goes into is reasonably easy to remove with a philips screwdriver and needle-nose pliers). if you find the short, desolder and solder in a new part, or if its a speaker channel you can live without (you already lost your money), just clip one of the wires in the short circuit path.
one good thing- this reciever has a lot of nice features and settings (even though it doesnt do dolby through the HDMI port)Get more detail about Denon AVR-688 Dolby Digital Surround Receiver.
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