amp problems

Ive got an old jackhammer amp and its just suddenly stopped working, i turned the car off an on again and then nothing. Just occasionally the speakers make a popping noise. Ive checked the fuses etc and cant see anything wrong any ideas?

mannnn i got the same problem 2, and that the best amp i ever used, i am gonna cry, cant find nothing like it now, any one know what coz that that witha jack hammer amp, it just stop working and make this popping noise when u turn it on.

do have a digital muti meter.

I would have to actually look at it, make sure all the voltages are right - then look inside to see if something simple is burnt/bad