Without SCSI, if an IDE drive on the A4000 controller has an RDB, it starts booting, then gives a software failure. Not a Guru, but a dialog saying that SDH0: failed. This particular drive is SFS formatted and known to work in an 040 configuration in the same machine.
With just a floppy that includes the 060 libs, it will boot and fun from it just fine and all memory is shown. Doesn't show any problems.
Do you have the proper 060 libs installed on the hard drive?