System died? No sound

I just installed a 3650 eclipse amp to my alpine head unit , memphis fronts and rears along with a 10 in mtx sub. I ran the power down the drivers side and the rca and speaker cables down the passanger side. The system sounded awsome for about 30 min then a loud screach and then no sound. I check the fuse in the engine compartment and the 2 fuses on the amp,  they are all fine. The amp powers up but no sound. Well a dull hum in the speaker and thats it. There is a slight smell on the adjustment side of the amp. I grounded the amp to the rear seat post bolt making sure to sand off the paint on the bracket and the bolt. I used the same size wire (4 gauge) to ground the amp and power it. Did I screw up and not have a proper ground and fry my amp? I can't figure this out.

Thanks