I moved all the data from the supplied 4gb microSD to a 16gb one and since then the 3ds won't switch on. It's unhacked so I don't think the SD card switch had anything to do with causing the issue, but I figured I'd mention it anyway. Symptoms: 3DS doesn't switch on under any circumstance Plugging in the charger with no battery inserted results in the red power light (charge light?) coming on for around 3 seconds then going out again Plugging in the charger with the battery inserted results in the red light coming on for about 6 seconds with a small flicker after the first couple of seconds I have tried with both a USB charging cable and an AC adapter. The battery was fully charged when I swapped the SD cards. Incidentally the unit has always been a bit odd in the battery department. Occasionally the charge level would show as full and then after just a few minutes of play the red light would flash rapidly to signify low battery and I would need to plug it in quickly to prevent the unit shutting down. Any ideas?