CD-ROM Drive Not Detected In PnP System After CD-ROM Drive Installation And All Parameters Settings Are Correct

Problem:

CD-ROM Not Detected In PnP System After CD-ROM Installation and All Parameters Settings Are Correct.

Cause:

Systems with PnP BIOS have some of their IRQs reserved by the BIOS for configuring PnP PCI cards/slots. They are named as INT A, INT B, INT C ,INT D, etc.(depending on the number of PCI slots present). Usually the IRQs reserved will be 9, 10, 11 and 12. For the Sound Blaster card's built-in IDE port, the common IRQ's used are 10 and 11 (which in this case, is being reserved by the BIOS). This will cause the CD-ROM drive to not be detected.

Solution:

Change the PCI IRQ assignment (in the BIOS setup) to another IRQ if the Sound Blaster card's IDE port's IRQ is being reserved by BIOS in the Plug & Play assignment.