System no longer "sees" my DLT drive - Adaptec card seems to be fine though

Hoping for help before going the route of purchasing new cable, etc.
I need to format a dual layer job for replication onto my DLT 7000 tape drive but DVD SP3 says the drive is not connected. I un/re-plugged all, made sure to start DLT first and let it go through all it's motions but still no good. System profiler sees the Adaptec 2930CU card and when I connect to my Epson scanner (different cable needed than the DLT drive) it works fine. So I have little reason to doubt the Adaptec card and it always worked before with this DLT drive. I had to loan out the Adaptec card to a partner while I was out of town a few months ago and we have not had any jobs requiring replication since then.
The system profiler does not see the DLT and obviously nor does DVD SP3 at this time. Is there some chance a setting/extension was thrown off by disconnecting the card and putting it in another G4 then returning it in it's former slot.
Thank you in advance for any support.

Hal,
Sorry for the delay to get back to this post.
Your help is appreciated.
I have made sure after unplugging all concerned components to start the DLT drive first before turning on the G4.
I have removed the Adaptec card from my computer and given it along with the DLT drive and cable to my partner (as it last worked on his G4 - while I was on vacation/business travel). He reports the same problem. We will be purchasing a new cable today in hopes that will resolve the problem.
I hope it is not firmware/software related as that type of problem is usually a recipe for getting to know how poorly supported that aspect of troubleshooting can be when it comes to vendor volleyball.

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