Intel-Based Apple Portables: Troubleshooting a computer that will not power on

There are some simple troubleshooting steps you should try if your MacBook, MacBook Air or MacBook Pro won't turn on. Use these steps if: Your Apple notebook's display has no picture after you turn it on. You don't hear any fan or hard disk activity sounds after you turn the computer on, and the sleep light doesn't turn on. The computer doesn't seem to have any power when you try to turn it on.