My MacBook PrO running Snow Leopard started having display issues this morning, screen flickering then half black then all black. It was only the screen because if i shined a flashlight on it, i could still see the content and things working. Rebooted, still the same. THEN i see a bunch of suggestions online to turn off computer, unplug AC adapter, remove battery, press and hold power button for 5 sec, then reinstall battery, reconnect power, and turn on. I did this and now my computer won't boot up at all! When i press power button it makes the startup chime repeatedly and that's it It won't start in safe mode either.