text: check connector  driction cable \ncheck all extention cards are good place and gppd couple in mb \ncheck cpu and fan corretly couple with mb \nif prob is continued :\nremove modem ,anetwork and all card ( exept vaga)\nif continued \nunplug all  cable  and  turn on \nif countinued \nreplace ram \nif countinued \nreplace cpu \nif countinued \nyour mb have problem call expert  hardware man