When I turn on the laptop it makes the noise like its coming on. I can hear the computer running but the screen is still black. Ok now when I start it and it does turn on, the apple screen comes up and it loads perfectly fine. I can see the icons on the bottom of the screen. The mouse moves and seems to be working normal. As soon as I click an icon to go into a program lines start running on the screen, kind of like how old tv's with bad reception used to. And then it goes back to the home screen but its frozen, the mouse doesn't move keys don't work, nothing. please someone help me figure out what the problem could be???