Having problems with my system

[ent3rdadragon 10+ year member]

I was changing my amp and when I turned on the car, it was thumping for a sec and then it suddenly shut off. My speakers , sub, and amp completely shutdown. then I tried to replace the amp and it wouldn't turn on. My deck turns on now but that's it. I dont see why my speakers turned off cause when i installed my sub, the speakers were not touched during the process. I already checked the fuses in the fuse box and on the amp. Can anyone help me out??

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