I'm working on an M90 laptop. The laptop will not power on at all. I have tried 3 different AC adapters and 3 different batteries that all work on other systems. I have replaced the motherboard twice and I replaced the palm rest panel with the on/off power button. This is what happens EVERY time. Without the AC adapter plugged in when I press the power button the LED light flashes green. With the AC adapter plugged in, when I press the power button, the LED light flashes green and the ac adapter light goes off. With the AC adapter plugged in, the charge light flashes green and amber. I left it plugged in overnight and tried to power it on the next morning but the same thing happened. Does anyone have any idea what the problem could be?