H/K's are very sensetive in this area. It doesn't take much to send them into Protect mode.
I'm sure you've already done so but the first thing to do is to check all the speaker wire connections and make sure a stray wire isn't touching anything.
Then, try removing one speaker wire at a time and see if you can isolate the problem to one speaker.
Make sure all speakers are set to Small and the crossover to 80 or higher.
You can also try resetting the receiver. The procedure should be in the manual.
If all that fails to solve the problem then call H/K. But I'm not sure what they can do for such an old receiver (5 years in an eternity in electronics). Might be time for a new one.
Edited by gene c, May 05 2013 - 06:47 PM.
"Everyday room": Panasonic 58" Plasma, Dish HD DVR, Pioneer Elite vsx-23, BDP-23 BR, dv58avi universal dvd player, Paradigm Studio 20 V1, CC-450, Dayton HSU-10 subwoofer.
"Movie/Music room": Toshiba 65" DLP, Dish HD receiver, Marantz 7005, CC-4003, BD-7006, Polk LSI25's-LSi7's-LSiC, 2 original Dayton 10" "Mighty-Mites" subwoofers. (subject to change without notice).
Also have MB Quart Vera VS05 +.....too much to list. Help me.