Hey guys, I bought a used EMS 64M USB cart (probably a mistake haha), and it doesn't seem to work properly. I can get it to appear as a USB device, and write to it/format/etc using the GB USB software (although, the Card Information section is blank when I copy LSDJ to it, and shows a whole bank of the same rom image on both pages when I copy anything else to it, which might be a warning sign?).. but when I try it on my DMG it doesn't even show the Nintendo logo, just some horizontal lines with no movement or sound. On CGB the screen is totally blank, also no sound. I've tried formatting the card, cleaning the connector with isopropyl alcohol, and trying to seat it slightly differently in my DMG and no luck. It also doesn't work in the BennVenn Joey-Squinson card reader (doesn't even come up as a drive).
Is there anything else I can try? Would removing and re-seating the battery do anything? Could it even be a flat battery issue? I'm fairly new to this gameboy stuff so I'm not sure what I can try.
edit: I also have a mac so I can give the osx software a try if that might help..