2002 Altima: Bose Radio

[j0hahn01]

I bought my altima in june and everything was great, including my bose sound system - until it got cold. When it got cold, the car would have to warm up before any sound would come through the speakers. Eventually, sound quit coming altogether. The actual radio unit works (you can change channels, cd's, volume, etc), but no sound

SO

Is my amp completely shot?

Is it just a fuse?

Any ideas how to fix it?

thanks,jason