jvc th-m505 powers off right away

Hi there, Hope someone can help. I have the JVC TH-M505 and it was working fine until one time while i was listening to music, the wire from the main unit to the sub came off. Without even thinking to turn the unit off first, i plugged the wire back in. Since that time, every time i try to turn the main unit on, it power off right away. I've check all the connections and even checked the internal fuse and all is o.k. Any suggestions? Was hoping to be able to resolve myself Thanks in advance

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