I bought my 2010 Jazz in June from a used car dealer locally. They said they'd checked everything but when I came to try a CD about 6 weeks later, the CD player takes the disc but then spits it out with the message 'Bad Disc'. So obviously I tried several others, but got the same result. Does anyone have any ideas? The radio works fine, so I wonder if the player is just dirty? The dealer says they'll look at it, but their warranty doesn't cover it, so if I can fix it myself ...