Well first off, I am not good with macs at all...and I have messed up my brothers computer The problem- My brothers laptop is a black macbook, and I was using it to surf the internet and whatnot this morning. The internet was'nt working very good so I decided to restart. I tapped the powerbutton which brought up the options. I clicked Restart and thats where the problems began. The computer began to restart, but as it came up it would go through the white screen ( apple symbol and circle) and then would contine to a blue screen. It then just gets stuck on the blue screen and wont go anywhere. The mouse is also sometimes visable. I have tried taking the battery out and whatnot. PLEASE HELP...Taking all suggestions thanks alot.