Success! I swapped in the SI power supply, and Sea Wolf fired right up. Looks like I'll need to rebuild or replace the old one.
I did, however, uncover a couple more issues. The explosion sounds- they're missing. I get a small pop, but that's it. All other sounds appear to be working fine.
The bigger issue is that the picture occasionally goes out (but I still have neck glow) and the game plays blind. Any ideas?
Oh, and one more question. Does the game normally use white fluorescent lighting or a black light? There's a white light in there, but I think a black light might look cooler.