I have a 4 year old toshiba satellite laptop. It has been working fine, tho recently I will be surfing the net, playing a game, or typing away and the screen will go black. I press the little button (the one that gets depressed when you close the lid of the laptop) for one second and the screen comes back. everything hunky dory. this problem is intermittent. sometimes it occurs 4 or 5 times immediately in a row, sometimes its just once a week. any ideas? my warranty was up years ago.