Lynne, the commonest reason when many CDRs don't play on one player is because that CD player is very old. It's not that they wear out (though that happens too) but CD players made before CDR was in common use simply aren't designed to read them. (tech note: same format but weaker markings on the disk: light/dark grey vs. black/white)

The next commonest reason is that they were recorded on not best quality blanks or with a CD recorder that wasn't too good, in which case there's not a lot you can do about it.

You should be able to play them without any trouble on a computer CD drive. If that doesn't work either the CD is a really duff one and you should get it replaced.

Always keep CDRs away from heat and sunlight or they'll get worse.

I burn CDRs on really cheap unbranded blanks using a Plextor drive; they are never the cheapest CDR drive but they are better designed and seem to produce good results on anything.

And before the self righteous copy protection police jump in again, I'm talking about CDs Mary and I have recorded of our own music - "Through The Groves" is a home produced CDR and we've had no playability complaints. Our demo is a CDR too, like most.

Anahata