Hi there,
Sorry I probably got too involved too quickly, when you've checked all other bits and bobs, my guess is that the switch PIA and one of those 4 z11-z14 ic's has gone down, I had a Victory and a Gold Wings and both wouldn't boot, after quite a bit of checking this and re-pinning that I got a bit more involved in these mpu repairs and, although it's a couple of years ago now so a little hazy, I popped the mpu's on my rig with Leons test chip and both had got Switch PIA faults, and one of those chips was down and for the life of me I can't remember which of the 4 it was. There are of course many mpu problems that will stop the mpu booting but if it went down in a game, my moneys on the switch PIA and one of its related buffer chips.
No probs mate all advice is good knowledge to have in the long run. Will definitely try the easy wins first and then move onto the harder stuff. You don't still have that Leon test rig do you??