My A21 died yesterday. I think it went into circuit protect mode. The power button stays red and does not turn blue like it is suppose to. I unplugged all connectors and cables, unplugged the unit, plugged it in again but got the same result. I checked the fuse and it looked ok. I really never push the amp and it rarely gets beyond slightly warm.
Good thing it is only a year old and still under warranty.
Anybody else have this problem?