I'll check to see what brand my SD card is tonight.
However, keep in mind that many people on the Krikzz forum have reported TED issues when their Core Grafx or whichever PC Engine model they are using has a region mod. Basically, some region mods work with the TED, and some don't. If you don't get an answer here, check the Krikzz forum and let them know how the region mod was installed. Someone there can probably tell you if the mod itself is the problem.