My MacBook Pro tries to turn on then shuts down
My MacBook Pro was taking a long time to turn on displaying a bar that took forever. Now it turns on and the circle goes around and it shuts off!
MacBook Pro
It's possible your hard drive has developed a fault. If you're able try and back-up as much of your data you can assuming it's important to you? Thereafter make an appointment at your nearest Genius Bar or Apple Store or Apple Authorised Repair Centre for diagnosis and repair.