Radio not working

I have a dodge 1984 Ram prospector and one day the radio worked fine and then the next, no sound. It turns on, both speakers make a clunk noise like they are turning on then no sound..The display comes up like it is on the radio station and everything but no sound. What could be wrong?

factory or aftermarket stereo ?

Factory, and I looked at the back of the radio and everything is plugged in

sounds like the internal amp is blown, hard to tell though without seeing it