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Given that you've tested many known good units (correctly terminated I assume since you're using them with other macs), I'm afraid the problem must be coming from the SE/30 board.  Can you please post pictures of the top and bottom area around the SCSI chip? 

What LaPorta said, plus the following: - Have a high wattage iron on hand (50W+). Optional but very desirable (Oh I wish I had brought mine with me!): Desoldering Station. - It's particularly difficult to remove the big snap on capacitors. There's apparently only two on the 660. The 900/950...

Thanks Gorgonops! Sit rep: Finishing the recap and redoing/cleaning all the solder joints didn't fix it. It's arcing now (for a brisk moment when it gets connected to mains power), so I'm nervous every time I'm near it when it's plugged in. This cannot go on, I've invested too much time on this...

Is this a Powermac G5 or a Mac Pro? 1,1 and the speed rating would indicate first gen Mac Pro with INTEL processors.  If so it has pcie slots, not pci. Either way, mac sata controller cards are available, for intel or ppc. But please confirm your exact model before buying anything...

Congrats! I can imagine how happy you must have been when you saw it post!

Here it is:

The RCA video cable is platinum grey, and the connector housing ressembles that of the Mac Portable’s low power mouse.

@BL! What version of HD SC Setup are you using? I've never heard of this glitch. I know it's supposed to work just fine. 

I've even heard reports saying that 64mb SIMMs work. But getting a 32mb FPM is the recommended route. Plus, I don't know if that much RAM is even that useful in a 66MHz DX2 machine...

That’s a typo in the guide... This is what I used to set up a scsi2sd hard drive emulator. I wrote a 1gb image to an sd card using this tutorial. Writing a 1.44mb image to a floppy is the same process. Be careful to get select the correct drive identifier or you might wipe your hard drive!

Welcome to the club. With what you have on hand, you should be able to write to floppies without a problem. But here's a few tips to kick things off... General maintenance:    - Capacitors on the logic board. They need replacing. Absence of sound is a typical symptom. You'll have to replace...

Apple HD SC Setup expects a certain number of characters when it reads the drive’s firmware. If a space was missing no wonder it didn’t show up.  Lido or Silverlining will set up the drive correctly no matter the firmware. 

So you have the correct settings and it still doesn't show up? Have you tried another utility like Lido?

@BL! 1/ Is the device terminated? Check the box on the 'general' tab of scsi2sd-util 2/ If you're using the unpatched version of HD SC Setup, you can only format drives that have the apple firmware. How did you configure the vendor and product IDs on your SCSI2SD? From the OP:

The PSUs aren't particularly troublesome in my experience. I have 3 tape backups, one 40SC and one CD SC that all share the same PSU and only one is acting up.  My 40SC has a Sony drive. No idea what Apple went with for the 80SC. I hope it's not a Quantum! Also, one last thing, the feet for...

Still haven't restarted it. Will do tomorrow.  In the meantime, since this appears to be a more complex issue than I initially thought, could one of the Admins/Mods  ( @Gorgonops @Bunsen @Cory5412 @wthww ?) move this thread to Mac II, Quadra & Centris? Thanks in advance!

I don't have an ESR meter, perhaps I should... That's another possibility. I'll redo all of the ones I did.  One thing I forgot to mention earlier. The first time I started it up today, I used the keyboard, and the 3 LEDs lit up and the system LED was on for a moment. The clicking and...

I AM SICK OF THIS PSU. IT'S BROKEN AGAIN. Same behaviour as last time, no LED, and the PSU keeps resetting itself. It worked great for more than an hour and a half and I tested it again before going to sleep yesterday evening. EVERYTHING was fine! And now we're back to square one again. Could...

I expected to see more dust than there actually was. That explains it. Thanks! Some components still had a thick layer of dust that was caked on there. But that’s to be expected after 27 years and air can’t get everything out. That fan is indeed tough to live with. I have bought a Noctua...

This thing is A REAL PAIN to work on. The good thing is that I apparently fixed it. I really hope I haven't jinxed it by saying that. It's running as I'm writing this and so far so good.  I ended up fixing that trace the best I could (not my finest work though), and replacing the rest of the...