96' Stereo Issues

I am having trouble with my car stereo...I have the same electriconical issues with my speedometer and other gauges that everybody else seems to has, but my stereo also does the same thing. It works every once in a GREAT while, and a lot of the time I'll get a little green line (it's like the top of a 0 or an 8) but that's about it. Any suggestions? Could it be the actual stereo or the wiring? Any suggestions will help, thanks.

Mat