truoc tien ban kiem tra may co cham vbatt ko,neu khong cham thi dua len may may dong xem co dong ko.neu khong co dong ban nen kiem tra contac nguon va duong di cua no.neu dong tot ban cho nuoc rua vao duoi chan uem va cpu roi thoi lai cho sach.dong may tot thi ban chay lai phan mem thu xem.chuc thanh cong nhe