I have an acer aspire laptop, and i had it for about four years, i had a little pproblem with it before but i just had to erase everything from my hard drive. But now it will not start up at all, it comes on amd the green start up button ligths up, then it shuts down again, and i tried fixing by clearing the hard drive again, but i can't when it does not completely start up, sooo i do not know what is wrong with it.