From what I remember, the daughterboard absolutely must be installed for anything to work. Plug it and the floppy drive back in.
Oh by the way does anyone know if the A4000EC04 uses a socketed cpu?
All A4000s have the CPU mounted on a processor card. On 68040 models, the chip should be socketed on the CPU board. On 68030 models, the CPU is soldered to the board. Revision D motherboards are the exception - they have 68030 chips soldered to the motherboard.