300zx nw

my stereo started acting up. like when im and driving it will get louder. it would flick on and off by its self. and make this loud buzzing sound. it was making me mad so i pushed in the power button to turn it off and now it wont turn back on this is the stock radio in a 85 300zx. i checked all the fuses in the fuse box next to the clutch and none of them look like theyre blown. what else should i check?? does anyone know what amp fuse runs the stereo??