In the most common scenario, the jumpers were not set proper. Many machines require both drives set to CS, others will want one drive master, the other slave. I won't be able to tell what yours will be.
Intel(r)family 6 model 5 processor
I installed a cd/rw drive and when I plug the cable into the cdrom drive, neither drives work. I unplug the cable from the cd rom drive and the cd rom works.
I know that this is probably a simple solution, but I don't know it.
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