Memory board switches should be:
SW1 all on
SW2 all on except 3
SW3 all on except 1 & 2
SW4 5,6,7 & 8 on, 1,2,3 & 4 off
You could try booting it up with the dual axis cards pulled out of the slots in the backplane (no need to pull them all the way out). If it does start, replace them one at a time to find the culprit. the system will run slowly with these out).
It may be a comms problem between the CPU and the CRT controller. You could replace U14 & U15 on the CPU (under the graphics card) and U11 & U15 on the CRT controller. These are MC1488 & MC1489 (one of each on each board) and do the serial link between the boards.