CPS-3 hardware can be very finicky at times. Aside from checking the 5/12v. I can suggest reseating / cleaning the SIMMs. Clean all slots, the JAMMA / cart edge connector and maybe even blow the cart like an NES cartridge before inserting.
If that doesn’t work. I’d try to boot off CD instead of SCSI2SD. Or try other parts if they’re accessible.
I’d also recommend trying another SD card and making sure it’s written right/your SCSI2SD settings are also right.
Good luck, if all else fails, get UltraSIMMs
If that doesn’t work. I’d try to boot off CD instead of SCSI2SD. Or try other parts if they’re accessible.
I’d also recommend trying another SD card and making sure it’s written right/your SCSI2SD settings are also right.
Good luck, if all else fails, get UltraSIMMs