On a SuperKickstart machine, you must have Fast RAM - either buy some or move over the 2nd MB Chip RAM to the Fast RAM sockets and jumper appropriately.
Another option is to replace the 1.4 boot ROMs with a ROM Kickstart 2+ (3.1 recommended).
The Kickstart is loaded from disk into Fast RAM (only) - if there's no RAM, there's no way to run any kickstart (other than hitting the invisible close button on the Kickstart selection window).
Of course you can generate a 3.x Superkick disk, too, but you'd lack the license to use it. Note that you'll need an A3000 Kickstart, otherwise your SCSI and Fast RAM will be missing (AFAIK).