Try jumper 301 in open and closed position during boot. I can't recall well, but I think it will cause an issue if incorrect for the number of floppy drives you have installed. (1 or 2)
Also try swaping the large CIA chips in their sockets. If the system behaves differently when they're swapped, then one may be bad and need to be replaced. CIA talks to the floppy.
Plaz
