I shutdown my Macbook today because the sound wasn't working. Once i tried to restart it the computer made its normal start up sound and went to the blue apple screen with the loading thing underneath it during this process the computer turns off and goes to a black screen. It seems that it decides to shut itself down. I charged the computer completely thinking that would solve the problem and it did not. I have tried to start it back many times and I keep getting the same result. Does anyone know what the problem is or how I can fix it? Thanks!