You might have jarred the connection loose on an interconnect or the input jack on the amp. Not that uncommon. Do the basic troubleshooting procedures that are mentioned above and in other threads and try and track the problem down. Power amps should always be turned off or at least muted as a safety measure when hooking / unhooking cabling. Otherwise, one very quick and simple mistake can take a BIG toll on your system and wallet. Sean
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