OK so i have updated my t2i to the newest firmware (1.09 i believe?) and i put the magic lantern firmware update onto my 32gb if.3c sdhc card. I had some pictures and videos on this card. I put it into my card reader and uploaded my pictures into iphoto. i then deleted the pictures and some videos from iphoto itself (but i left a few videos on the card). after i put the card back into my camera, the camera turns on, but the screen stays black, i can't access the menu or any other option, but the autofocus works fine. when i put it back into my card reader and open it up on my mac (OSX 10.6.7) i get the error "The disk you inserted was not readable by this computer".
my guess is when i deleted some stuff through iphoto it might have also deleted some of the magic lantern files, which locks up my card.
any ideas? i hope i can still recover the videos on the card