Power Problem

I've had a FSW111 for several years and have experienced no problems until this morning when I awoke to find a loud buzz coming from the sub-woofer. The sound did not vary with changes to the volume or low pass knobs, nor upon removing the line in cable. It stopped upon unplugging the power cord. Plugged the power cord in again and the buzz started again. After again unplugging and again plugging the power cable the buzz stopped. Now the sub-woofer is completely dead except for the power light which lightly blinks green. Please help.

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