I have built many desktops overr the years but am trying to trouble shoot a Toshiba Satellite for a friend. It is model L655D-S5093. When you press power cpu fan runs at full speed and the screen is black. No bios, no cursers nothing. Tried switching out battery, switched RAM around, made sure brightness was turned up all to no avail. I get no bios post beep but not sure if laptops all beep when bios posts. I really do not have enough knowledge to dissasemble a laptop and truthfulyl do not want to. Tried all the F2, F8 and DEL to get into bios but get nothing. Even if thr HD was bad I should still be able to get into bios. I am thinking either the MOBO or CPU are bad. Any ideas Thanks