What size and type of SD cards are you using? I've found that 32GB is the practical maximum, though 64GB cards may work.
Check that both the SD card and cartridge are seated properly, and that the cartridge slot and card edge contacts are clean.
One last thing: did you buy this with a HOKEY installed?
Yes hokey is installed and I have tried about 6 different sd cards ranging from 4 to 32g.. Also tried the card that came with another 7800 multicart it didn't work either.. Works perfectly on the concertio
I have tried everything to make this work.. Multiple SD cards but I always get this when I plug it in.. also my MacBook never discovers the device despite trying to install drivers mentioned in this thread
Concerto issue
in 7800 Concerto Multicart Support
Posted
Yes hokey is installed and I have tried about 6 different sd cards ranging from 4 to 32g.. Also tried the card that came with another 7800 multicart it didn't work either.. Works perfectly on the concertio