Computer no longer sees DVD or Zip drives

Hey there all,
Here's one for you. I have a G4 Gigabit Ethernet that I've upgraded with a Powerlogix 1.4 Ghz processor and an ATI Radeon 9800 Pro. The two drives that came with the computer (the Zip 100 and the DVD-ROM) have stopped working. I can't pinpoint exactly when because for a while I used them only rarely. I do know that they worked after upgrading the chip and I've only just now upgraded the graphics card so I don't think either of those have affected them.
They are still getting power because the light on the Zip comes on at startup (and will sometimes stay on for a loooooooong time though it doesn't make noise and there is no disk inside) and the DVD drive will still open and close. However, neither drive will mount when a disk of any sort is inserted.
I've tried running System Profiler and they don't show up in the lists there either. I checked the ribbon and power cords internally and all the connections SEEM ok. I even just now tried hitting the Cuda button to reset things but that turned up bupkiss.
Any ideas? Any advice? Anyone ever dealt with this before? I 've been shopping around for new drives but before I lay out the cash for that I want to make sure that these aren't saveable. This computer has been an absolute rock for about 6 years and has never had any major problems that I couldn't resolve so I'd hopefully not have to replace it.
Thanks all for your time and consideration, I'd really appreciate any and all help you can offer. Cheers!
G4 Gigabit Ethernet Desktop and 15" G4 Laptop   Mac OS X (10.4.9)   Mac OS X 10.3.9 on laptop

Hi, RaptorRed67 -
Does the fact that the Zip drive read light comes on at startup and stays on for minutes to hours afterwards bear any clues?
That light is intended to serve as a diesk-being-read indicator. If it stays steady on, that usually means the Zip drive has somehow managed to hang, and needs to be reset. It can also indicate a non-readable disk is lodged inside.
The way to address a disk hung inside is to restart, then immediately press the mouse button, keep it held down for a while. This is a hardware instruction to the Mac to eject all removable media, and operates before any drive has tried to load a disk which may be present.
If the drive itself has hung, which can happen after a non-mountable disk has been ejected, the only way to reset it is to power it off. This means shutting the Mac down - a restart won't do it.
Since you've unplugged that drive, the Mac was probably powered down when you did that. This would indicate there may be something else wrong with the drive, if it is in fact the culprit.
The two drives, optical and Zip, need to be jumpered correctly in order for both to function, just like hard drives. The optical drive should be jumpered as Master, the Zip drive as Slave. It is possible that a jumper fell off.
There may also be something wrong with the controller that serves the bus shared by the two drives. Don't know how to test for that other than to take the machine to an AASP.

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