Apple MB466LL/A User Manual - Page 55

If your MacBook doesn't turn on or start up

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If your MacBook doesn't turn on or start up Try the following suggestions in order until your computer turns on: ÂÂ Make sure the power adapter is plugged into the computer and into a functioning power outlet. Be sure to use the 60W MagSafe Power Adapter that came with your MacBook. If the power adapter stops charging and you don't see the indicator light on the power adapter turn on when you plug in the power cord, try unplugging and replugging the power cord to reseat it. ÂÂ If the indicator light on the MagSafe connector is amber, the battery might need to be recharged. Keep the power adapter connected and charge the battery with the computer off. A green light indicates that the battery is fully charged. ÂÂ If the problem persists, reset the MacBook power manager (while still preserving your files) by pressing the left Shift key, left Option (alt) key, left Control key, and the power (®) button simultaneously for five seconds until the computer restarts. ÂÂ If you recently installed additional memory, make sure that it is correctly installed and that it is compatible with your computer. See whether removing it and reinstalling the old memory allows the computer to start up (see page 46). ÂÂ 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. This resets the parameter RAM (PRAM). ÂÂ If you still can't start up your MacBook, see "Learning More, Service, and Support" on page 64 for information about contacting Apple for service. Chapter 4 Problem, Meet Solution 55

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55
Chapter 4
Problem, Meet Solution
If your MacBook 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 60W MagSafe Power Adapter that came with your
MacBook. If the power adapter stops charging and you don’t see the indicator light
on the power adapter turn on when you plug in the power cord, try unplugging and
replugging the power cord to reseat it.
Â
If the indicator light on the MagSafe connector is amber, the battery might need to
be recharged. Keep the power adapter connected and charge the battery with the
computer off. A green light indicates that the battery is fully charged.
Â
If the problem persists, reset the MacBook power manager (while still preserving your
files) by pressing the left Shift key, left Option (alt) key, left Control key, and the power
(
®
) button simultaneously for five seconds until the computer restarts.
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 it and reinstalling
the old memory allows the computer to start up (see page 46).
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. This
resets the parameter RAM (PRAM).
Â
If you still can’t start up your MacBook, see “Learning More, Service, and Support” on
page 64 for information about contacting Apple for service.