Ok, heres what happened. My mate and I both have r4's and we were playing animal crossing online for the first time. We had fun for half an hour with me trashing his town and trying to teach him to fish. Then I was in his house telling him how my house was better and the game crashed, at both ends. I thought that was that, play with flash cart, sometimes it will crash, but the next day I try to play animal crossing, and get a black screen after 'nintendo' that doesn't go away! So I copy everything off my cart, and put just the menu and animal crossing back on. Only it says it won't let me because animal crossing is already on there and it's 0 bytes big. So I reformat the card, and copy everything back, and everything works! Animal crossing is fine etc. But today, advance wars won't run. just crashes when I try to run it. Here are my current theories: 1. something to do with having .dpg files on my cart? It's the first time I've put anything big on, but I'm not sure how that would affect it. 2. DsOrganise? Only added that a few days before the first crash. 3. Busted SD card? Could my SD card just be totally fried? 4. Something to do with my running the .dpg conversion program whilst I'm copying stuff to my sd, cos it's screwing the rest of my pc pretty bad? 5. aliens. HALP! FIX IT!