Today I purchased a klipisch lr106476 ported and powered subwoofer from the local pawn shop, just trying to give my current surround sound more depth, well I can not get the sub to turn on, the fuse was blown so I replaced that with a 250ma fuse, I believe that was the identical match, the marking was hard to read, what else could be my issue? My old sub works fine so cable and my denen avr 1713 is fully functioning, please And thank you for any help or input, my last resort is trying to open up the back to check internal connections