Hi all, I've had this receiver for about 4 years, and it's been working like a charm (after the initial clean-up when I first bought it). Then today, I heard a faint pop, and it stopped working normally. To be more precise, it does power on (the display lights up), but there is no more sound on the right channel, and the left channel seems to be very low and distorted when playing Phono. When playing Aux, the right channel is silent as well, but the left channel seems to sound normal. The FM source doesn't seem to be working at all on either channel. Switching from speakers to headphones doesn't make a difference. Any ideas what the problem might be, and how to solve it? Thanks a lot!