My mother in law has been having problems with her newly purchased Dell Dimension 5100c regarding her video jumping intermittantly. She has called Dell multiple times, but when she calls, she cannot get the machine to start "jumping." I originally thought that it may be a defective video card, however, I am told that this model doesn't have the traditional "card" in the motherboard and that it is incorporated in the motherboard. Due to the fact that I don't want to jeopardize her warranty, I have not opened the tower myself. Dell is telling her it may be a software issue, but this problem has been ongoing for more yhan 5 months now and nothing has been fixed. A local PC repair place close to her home said it may be the wireless router. Does anyone have any other ideas and/or suggestions?