I have an iMac G3 running OS 9.2 with a defective internal CDRW drive. I attached an external USB CDRW drive. I can read data CDs with it, but audio CDs are just ejected. Blank CDs stay in, but are not accessible. iTunes 2.0 does not see the drive at all. What is the least expensive way to get an external CDRW drive to work properly on this machine?