Hey guys, just got my first boombox! But there is one problem... the tapes won't play. The box is a Pioneer Sk-550, and is in okay condition. The audio is better than I thought it would be, and everything else works, except the scale lights and the tape mechanism. FF and rewind work, and so does stop button, auto stop feature, and the eject mechanism. The only thing that won't work is playing the tapes, and it makes a strange grinding noise when attempting to play, FF and rewinding. What I want to know is if this is a potentially a simple fix like swapping belts, or if I should just sending it back and cut my losses?