Sorry about the newbie question everyone, I tried to search the forum for this problem but gave up when the search engine didnt give back the results I was after and looked through the last 20 pages in this forum I have a Chinese M3 DS real card - when I bought it in HK it came with a 1Gb Kingston Micro SD and has worked fine since. I've been reading that this card supports SDHC cards, so I went and bought a Kingston 4Gb SDHC (says JAPAN on it and is Class 4). It came with an SD adaptor but that doesnt read on my laptop card reader, the only way it works is if I use the USB reader that came with the M3 card. Anyway, so I used that, could only format it to FAT32, so I installed the latest firmware on it (3.7) and added the NDS folder for structure. I have not put any ROMS or programs on the card other than SYSTEM and the NDS folder. Put the card in the M3, and put the M3 in the DS, powered up and it sits there for about 5 seconds then says "NO SD CARD FOUND" Does anyone have any suggestions please?