I have a Gateway PEW91. When I try to turn it on, onlly the turn on buton lights up, but the fan and the hard disck don't appear to be working plus the screen never comes to life, it just stays black. There is been a couple of times that it actualy came on but is been 4 days so far since the last time a got it to work. So far any other attempt to make it come on has failed. Any ideas ??