i have a mds jb940 that has a weak laser, well thats what i suspect as it will play some discs and not others, its not disc make spacific, or how the disc is recorded eg sp or mdlp, it just dosent like some discs, i have 1 shop soiled one that i bought 20 years ago new, californication by the chilli peppers, it wont play that it gives c13, the ones it will play, it does each time and the ones it dosent well no cigar every time, i did clean the laser gently and have replaced the belt. all di