G'day aagin,That posting fell over...
Encore ... Sheila, the lens cleaning CDs Les in Hull mentions work well. His is costly at UKĀ£5. I use one from a discount store that cost Australian $2 - about a sixtnhof the price, but it still gets CDs that skip and stall working again in short order.
There can be more basic problems: Some CD-R and CD-RW formats don't work in audio players, especially older ones ... and there can be alignment faults in the laser set-up ... but start with a good gentle cleaning CD and system.
Regards,
Bob Bolton