Hi,

Make sure there are no shorts in the speaker connections either on the receiver or on the speaker end. If not there may be an internal fuse that's blown. Other than that it's probably a problem that's going to require professional repair.
Or any of your speaker wires are touching it will cause the receiver to shut down due to a built in safety mechanism. Also make sure no stray wires are touching the case.

Let us know if you want something more else please accept the suggestion.

Thank You for contacting Fixya.com