5101 RAM?
Maybe, do you think that would cause the system to fail to boot ONLY when the game ROM is installed? Normally when the 5101 fails the game will go straight into audit mode with the game ROM installed. This wont, only goes into audit mode with the game prom removed?
Might want to test the socket on this Dean. Sounds like the game MIGHT be trying to read the ROM and not getting the right signals. With it removed, it goes straight into audit mode due to lack of ROM programming..... my guess is that with only half a program being read the CPU locks up.
This is just a calculated guess though.. id have to read up my notes on sys 3 -7 again to really go further.
What made your friend remove the ROM??? Its the last place id be looking for a fault when we have interconnectors, PIA chips etc to eliminate first