AVS Special Member
Join Date: May 2003
Location: Peoria, AZ (75 Ave & T-Bird)
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Just unplug it from the back of the 8300. It's easy enough to do a hard reboot with 2 hands.
Also, did you try any of the other audio connections; L-R, optical, coax?
The hard reboot with reset the 8300 internals, clear the cache, reload the software and IPG. Hopefully something is just stuck software-wise. If not, sounds (no pun intended) like you may need to replace the box.