Apple MacBook Pro (Late 2007, 2.4/2.2 GHz) - Manual (Page 51)

Chapter 4 Problem, Meet Solution 51
If your MacBook Pro doesn’t turn on or start up
Try the following suggestions in order until your computer turns on:
 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, or try another power outlet.
 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.
 If the problem persists, reset the MacBook Pro power manager by disconnecting the
power adapter, removing the battery, and holding down the power (®) button for at
least 5 seconds.
 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 37).
 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).
 If you still can’t start up your MacBook Pro, see “Learning More, Service, and Support”
on page 59 for information about contacting Apple for service.