i have a sony mhc-2750 mini stereo and the cd player is not working. 2 of the 5 cd trays are not lighting up, it won't eject cd's, and there is a strong squeaking sound, as if the trays are jammed. What is wrong and is it fixable? could I fix it myself or do I need to have a specialist repair? Also, is it worth the cost of repair to have it repaired as opposed to buying a brand new system?