My daughter came to me saying her DS wasn't working, getting her to clarify that it's the cart, not the handheld itself. Tried it in my DS: No. Tried clearing off the SDHC to use fresh firmware: Had 4 .cc files, wouldn't let me erase them. Tried Panasonic SD Format: Wow, great little prog; fresh firmware still a no-go. Tried fiddling with SD card and/or flashcart: No. At least the card isn't pricey to replace, just bummed that it's dead...unless anyone can think of something else for me to try.