I have a 3DS and an Acekard 2i. Both are at the latest firmware levels. Several times now I have opened up my sleeping 3DS to find both screens totally black. Power, wi-fi and message lights appear to be working normally. The 3DS was on the Home screen before sleeping. If I power the 3DS off and then turn it on, the screen is still black. However, if I power the 3DS off, remove the Acekard then power the 3DS back on, the system powers up normally. I then put the Acekard back in and everything runs just fine. I am not able to reproduce this problem at will. Normally everything comes back just fine after the 3DS has been sleeping. The problem has only occured 2-3 times. Any ideas?