Hi.I removed the battery from the DS yesterday.It was only out of it for about 5 mins.When I but it back in it asked me my nickname and favorite color,and some dates.That isnt much of a problem,but I feel as if I see lines on the DS top screen while its on.The lines are like bad TV reception.I didnt go anything past the battery,but I dont see how it could have gotten harm.
Probably just coincidence. IMHO, could be one of four things, in order of likelihood: 1)Top to bottom ribbon cable 2)Topscreen 3)Top screen interface board 4)Logic board.