So i have a late 2010 macbook pro running os x 10.6.8. Recently everytime i push the power button to turn it on it starts up i hear the chime and then it immediately shuts down. I press the power button again and it starts and shuts down before the chime, i try multiple times but it keeps ending with the same result. The only way i can get it to turn on and stay on is if i hold the power button down for a few seconds and then let go, then it will start all the way. Please help, thanks.