Apple MB991LL User Guide - Page 49

If your MacBook Pro doesn't turn on or start up Try the following suggestions in order until your computer turns on: Â Make sure the power adapter is plugged into the computer and into a functioning power outlet. Be sure to use the 85W MagSafe Power Adapter that came with your MacBook Pro. If the power adapter stops charging and you don't see the indicator light on the MagSafe connector turn on when you plug in the power cord, try unplugging and replugging the power cord to reseat it. Â Check whether the battery needs to be recharged. Press the small button on the battery. You should see one to four lights indicating the battery's level of charge. If a single indicator light is flashing, allow the power adapter to charge the battery at least until that indicator light is glowing continuously. Â If the problem persists, return the computer to its factory settings by disconnecting the power adapter, removing the battery, and holding down the power (®) button for at least 5 seconds. Â If you recently installed additional memory, make sure that it is correctly installed and that it is compatible with your computer. See whether removing and reinstalling the old memory allows the computer to start up (see "Installing Additional Memory" on page 35). Â Press the power (®) button and immediately hold down the Command (x), Option, P, and R keys simultaneously until you hear the startup sound a second time to reset the parameter RAM (PRAM). Â If you still can't start up your MacBook Pro, see "Learning More, Service, and Support" on page 57 for information about contacting Apple for service. Chapter 4 Problem, Meet Solution 49