"No SD Card Found" error in M3 DS Real with Kingston 4Gb SDHC

As the subject saysI bought the Micro SD-HC card today, Kingston brand. The M3 DS Real says it supports the SDHC cards. I updated the firmware to 3.7 (Asia as I have a Chinese version) - the card has two folders - SYSTEM and NDS. Put the card in the DS and the "No SD Card Found" error comes up after 15 seconds or so.Strangely, my laptop will not read the Micro SD card with the SD adaptor in the card slot, but will read it when I use the M3 DS USB adaptor. Card is formatted to FAT32 (as that is the only option I have) and reads on the laptop no worries (USB only). The 1Gb card I have, also Kingston, works fine.Anyone know how to get this to work?

Most devices like R4DS don't work with SDHC cards 4gb and higher.