Tape won't play

I am assuming that the problem is with just the one tape...

Two things spring to mind - Either the tape has snapped or the reel lock mechanism is jammed.

1) Check the tape. With the cassette the right way up, press the little button on the right-hand end just behind the tape flap, flip the tape flap up and check that there is actually some tape there. If not, it's snapped.

2) With the cassette upside-down and with the tape flap facing away from you, you should see a small hole in the centre of the cassette about 2cm from the edge nearest you. Press something gently in here to release the reel locks. Then give both reels a couple of small turns back and forth (a finger stuck in the reel holes is ideal for this!) Before you put the cassette back into your machine, make sure there isn't any slack on the tape by gently winding any excess back in by turning the reels, but don't wind it to tightly - the moment you feel resistance, stop.

Hope this helps,

Matt