My macbook was sleeping until it ran out of juice. I think it was empty for about a day until I plugged it in. Now it won't start for some reason. I hear the optical drive start but it just turns off in just a second. Can someone help me out? I tried unplugging it and taking the battery out and pressing the power button for 5 seconds. I tried pressing various button combinations but the computer doesn't stay on long enough for anything to work. I've been using my desktop solely for the past few days because I only use my laptop at school. But I haven't been taking it lately because I didn't want to be distracted by the internet. This teaches me for being studious.