Floppy cables are center slotted, both ends, as are the drive and mobo connection.
I think it showed in the POST, but really, it was late by then, and I don't have a clear memory.
I'm thinking it's the case, and how the tray holds the drive (5 inch bay, floppy screwed to tray, tray into bay). Why that might be the problem, I dunno but ... clues needed, ya' know?
Thanks,
rr