The A4000T doesn't need the Audio/Video module to boot. I have been booting without it for months.
BUT It can't boot without the scsi/floppydisk module, and if it isn't correctly seated my A4000T won't boot.
I can boot without the floppy disk connected.
I can't boot from cold if I have an IDE hard disk connected, I have to do a reset. That doesn't seem to happen if the IDE device connected is a CDROM.
I usually boot from scsi drives
