@pyrre
How many power attachments have you made to the A1200 with PPC card? You have a 040 based PPC card with SCSI controller, and if the PPC CPU is a 160 MHz one as well, you won't get it up and running nicely (booting at power up) unless you give the motherboard and accelerator some extra juice.
Two power feeds to the motherboard and one to the accelerator itself should cure a lot of the problems you are having.
