shane, it tries to start up and then one of the screens flashes and it then powers down, notifies you that there is a problem with the screen. This is a check and that the screen that is not flashing has an error. Either the screen itself or the cable to it. If both screen flash, it is some other system error, like a loose or broken upper LCD cable. In your case, double check your work, make sure that your cable is seated properly and that the upper cable, which goes through the hinge, is not broken. The guides for your DSi are here. Hope this helps, good luck.