This laptop was working fine, all the sudden it shut down. I took the hard drive out and put it back in, I took the battery out and put it back in and the computer started again. Then after a while using it, it shut down again, this went on for about 6 or 7 times. Last night it did it again but this time is not coming on at all. The ac charger is connected you press the on button and small led light to the right come on and off but nothing happens. Could this be the mother board?