Strange Floppy Drive Problem

[Amiga4k]

neofree,
  A lot of suggestions, and no fix. OK, here's some more questions, some answers, and maybe, a solution. The simply obvious might have been over-looked.

Answers: Yes, the Paula 8364 ($13.00) is socketed. Has floppy, audio, and RS-232 control. PSU -- not ready to commit to it.
Suggestion: Re-install the floppy cable at the motherboard. Pay attention to PIN 1on the motherboard, and cable PIN 1 stripe. Make sure the drive is DF0, DS0 jumper, and connected at the end of the cable. This is the most common error on re-assembly.

[Amiga4k]

neofree,
  The text you referenced states the file is for the A3000T, which is the Tower version of the A3000. The file is also correct for the A4000 desktop. (I have no experience with the A4000T (Tower) units.
If you had told everyone the cable you were using it would have helped. I might have been tempted to test the theory.