Computer Not Recognizing Optical Drives

Question

I put a LG DVD drive in the bottom slot yesterday and now my Mac's not seeing either optical drive. The eject button says "No drives" and there's nothing under ATA under system profiler. Both drives have power and can eject manually. If I remove the SATA cable from the LG, there's no change.
Changed both jumpers to cable select, and tried other combinations. Did an SMC reset. Put the Mac in target disk mode and ran disk utility from my iBook. I really can't think of anything else and it's driving me crazy. Does anyone have any other ideas?

Answer 1

Okay, I fixed the problem. Through some inane, non-Apple-like, non-intuitive nonsensical procedure.
The problem initially was that my ribbon cable had a tiny tear in it. This was caused by one of the three aluminum posts that guide the CD chassis into the Mac Pro case. Really, really bad design, because the cable is flimsy and it's easy to snag it on one of the posts because you can't see anything when you are sliding the chassis back in, it blocks your view. So I had to go to a store on the other side of town for a new cable, luckily a sturdy one is only $10.
So I had to put the new cable in, which is behind the fan. But another design flaw with the Mac Pro, and some of you already know this, is that the front fan assembly is a monstrous pain to get out. Once you work that thing out, all the while thinking, "I know I'm going to break this", you can't help but marvel at how great the G5 fan assembly was, you could pull it out just to vacuum if you wanted.
So after I put the new cable in, I pretty much ran into every problem anyone with a Mac Pro has had in putting in a second drive.
The first one was the Superdrive showed up in the eject menu, but the text was garbled as if the system was using some unknown font. Like in the old days when you had to disable a fractional font because it was taking over your internet browser. I tried to put in a Leopard DVD, and it asked me what I wanted to do with the blank DVD. It did the same thing with a manufactured music CD.
So I tried to flash the drive with the NEC version on the web, but I was told by the Terminal that permission was denied even though I was logged into as the root user. So I thought I'd play the shell game with jumper settings again to no avail. Then I thought, what about Windows, I'll boot into that. But it saw neither drive.
When I booted back to Leopard, the eject button in the menu showed no drives again. But Superdrive was listed in Apple Profile. So I exhausted any way I could think of getting the Superdrive to work.
So I unhooked the master IDE and hooked it to the LG. It popped up in both the eject menu and Apple Profile. So I took the chassis out and swapped the drives. No sooner had I started back up again, then both trays ejected. Only the superdrive was listed under eject in the menu, and it wouldn't shut the tray. LG wasn't listed at all. When I pushed either tray in, they both opened.
I'd already changed jumper settings maybe 20 times in the last few days (they both were on cable select), but I did it one more time, and now everything is completely fine. I set the LG as master and the superdrive as slave.
However, they won't be allowing Macs in the mental institution I will surely be going to now.