I have a Toshiba Satellite M70. It won't start to work. When it power buttom was pressed, the ON indicator was lighted on but nothing else. A few seconds later (about 4s) then the power ON indicator turned to off. Whichever I use battery power or AC adaptor power, it shows same thing. Some guy told me the internal regulator dead. But how to check it? Now I disassemble it aparts. Only mainboard ( It means no DVD, HD, Video Card, Memeory, Nothing else but mainboard with CPU) still gives same the same thing. Any superguy can help me to fix it?