Before I even plug a game in:
- Check line cord and plug for damage (3rd prong ok?, cord nicked?, etc)
- Download the manual
- Pull each fuse out completely and check their value vs. manual
-- you want same amperage and same slow vs. fast/"normal" speed
-- ok to have higher voltage rating than called for
- Inspect fuse holders for tarnishing/weakness/damage
- test each fuse with multimeter (or not, as any blown fuse will become obvious during gameplay)