There might be zillions of possibilities for this.
Try DELL forum, search on "INSPIRON 8200 won't boot" or something like that at:
http://forums.us.dell.com/supportforums/board?board.id=insp_general
Try DELL forum, search on "INSPIRON 8200 won't boot" or something like that at:
http://forums.us.dell.com/supportforums/board?board.id=insp_general