micromega minium issues

I've had my micromega minium for a few years and it worked great I went overseas for work for a year and left them at home and now when I try to use it sound will only come out of one speaker. I've tryed working with the speaker wires and even replaced the wire. I tried the speakers with another amp and the speakers working fine so I'm sorta worried . any ideas would be appreciated. Sorry if this is under the wrong topic first time posting thanks for the help.