DO I understand correctly, that you have an external CD-R drive on your parallel port?
If so, you need to check the following:
1. Is the port set to ECP/EPP mode in BIOS settings?
2. Do you have the driver for the CD to use the parallel port?
You need to get this from either the drive mfg, or the company that made the external case.
3. Do you have the drive connected as the first device on the parallel port?
4. DO you have the drive, and all connected devices turned on when you boot your PC?
Many of these devices refuse to be recognized if they are not on when the PC boots, and refuse to function if connected devices (printer, scanner) are not also turned on.
Chas