Apple Power Macintosh 7300 series - PC Compatibility Card - Manual (Page 106)

Disconnecting the CD-ROM audio cable
7 Disconnect the audio ribbon cable from the CD-ROM drive.
Your Power Macintosh PC-Compatible computer came with an audio ribbon
cable that you connected from your CD-ROM drive to your Macintosh logic
board after you removed the card. You need to disconnect this cable.
Be sure to pull the plug, not the cable.
Just disconnect this end of the cable for right now. Later you will replace this
cable with the other audio cables that came with your PC Compatibility Card.
(top, back of computer)
106 Appendix B