Twice in the last couple of weeks, my center chnnel and left surround speaker have not worked when I have started a movie (Yamaha HTR-5640 receiver). I start the speaker "test" program, and the center comes back to life fairly quickly, but the L Surround stays off. While leaving the receiver "test" position in "L Surround" while consulting the manual, the Left Surround just suddenly starts working fine. While I am not touching anything! What could cause this? My speaker wire is all new, but not all the same type and guage. Can this cause my problem?
try resetting the receiver to default. check the manual on how to do this, it usually solves the problem. Start the set-up form the beginning and all speakers should work without glitches, if it does, chances are your unit is faulty. good luck;)