Can´t read burned CD´s

[Einstein]

Hello there,
This might sounds very silly, but please make sure you have the "write only" option ticked.
I had a pc in the other day with exactly the same problem, & the guy had "simulate only" ticked.
This means it would simulate the writing, but not actually burn it to cd.
Of course, when he put the cd in, it was still blank. Therefore, it gave "Drive not ready" error message.
Try it & let me know how you get on.
By the way, what software are you using?
Hope it helps.