Cannot get an optical drive to work in eMac 700MHz

Hi all,
I recently acquired a 700MHz G4 eMac and found that its Combo drive wasn't working. I could eject the tray and put a disc in, but it would then spin the disc forever and make a loud whirring noise.
I decided to swap it out for a SuperDrive that I'd just removed from my Power Mac G5. It's a Pioneer DVR-108AA which I flashed to enable Dual Layer support on it, so it's now simply a Pioneer DVR-108.
This SuperDrive works perfectly well in the G5, but when I go through the drama of dismantling the eMac and putting it back together with this drive in it, it's not recognised at all.
When I boot into OS X 10.4.10 I get a message saying I'd inserted a disc that OS X couldn't use; do I want to initialize it, etc.
System Profiler says no disc burner was found. I did once get Disk Utility to recognise it, but it thought it was a hard drive model "PHONEER DVB-108" - the characters were slightly transposed (like Ceefax and Teletext!), so I thought it might have been the IDE/ATA cable. I got an 80-wire 40-pin cable and tried that, but it still didn't get recognised.
Is there anything I can try to get this working? I'm not afraid of opening the eMac and tinkering, but I draw the line before I get to soldering...
Any help is much appreciated!
Thanks,
dp

Yeah, reset the PRAM and set the jumper to the same as the drive that was in there (Cable Select). I also tried it on Master and Slave, too, but it doesn't work.
The original drive is back in there now, and it makes a 'clunk-whirr' noise on bootup, but OS X never recognises it.
It's quite annoying because I have a 6 year old iMac G3 whose CD-R/RW drive is still going strong...

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