Mac doesn't recognise certain CDs

I have recently purchased 3 cds and my mac doesn't seem to recognise them and just spits them out!
Why is this and is there a solution? Other CDs are fine.

I don't think there is anything about them being "new" as such. It is not like they need to be broken in or anything.
When I see this kind of issue I first wonder if it is a drive going bad. You'd then expect it to be more consistent with certain types of CD (usually DVDs show issues first, then RW CDs and home-burned).
You could try a drive cleaning disc, just in case it happens to be chance it is happening with these particular discs. I have also seen people mention gently using compressed air, though I'd be worried about driving dust in deeper.
I guess you could try a SMC reset. Again that doesn't explain why only certain CDs but I have read about it curing some optical drive issues.
Apple Portables: Resetting the System Management Controller (SMC) - http://support.apple.com/kb/HT1411
Intel-based Macs: Resetting the System Management Controller (SMC) - http://support.apple.com/kb/ht3964

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