So, I just picked up a music hall mmf 2.1 from a friend. The cartridge on it was the one that came with the table, and I wanted to change it to a Pickering xv15 that I had on another table. (Note: never done this. Still a newbie. But I understood the concept and nobody made it out to be a difficult procedure, so I figured I was fine. I was not.) So I got both cartridges off easily enough, but failed miserably at trying to install the Pickering on the music hall. The screws for the music hall head shell were too long to work on the Pickering. I actually dropped the Pickering face down on the turntable at one point. Not sure how much damage this did to the stylus, but I'm sure it can't be good. So after stripping the screws to oblivion I decided to just put the music hall cart back on. Did that and realized I had no idea how to wire it. Tried a few different combos before I got one to work. Was playing fine for a few minutes... And then my speakers started making this loud humming noise, and the music stopped playing. I can make the humming stop briefly by tapping on the turntable, but it just comes back and I have no idea what to do. Did I mess up the wires? I didn't have tweezers or needle nose pliers so I was using regular pliers on the little wires. I was being gentle but maybe not gentle enough? Any help would be greatly, greatly appreciated. TLDR: changed cartridge, now there's a loud humming noise coming from speakers and music won't play.