Apple iMac (27-inch, Late 2009) Specifications download pdf (Page 46)

46 Chapter 4 Problem, Meet Solution

If your iMac freezes during startup or you see a flashing question mark

Â Wait a few seconds. If your iMac doesn’t start up after a delay, shut down your iMac

by pressing and holding the power (®) button for about 5 seconds, until it shuts

down. Then hold down the Option key and press the power (®) button again to start

up your computer. Keep holding down the Option key until your iMac starts up, then

click the arrow under the icon of the startup disk you want to use.

Â After your iMac starts up, open System Preferences and click Startup Disk. Select a

local Mac OS X System folder.

Â If the problem occurs frequently, you may need to reinstall your system software

(see “Reinstalling the Software That Came with Your iMac” on page 54).

If your iMac won’t turn on or start up

Â Make sure the power cord is plugged into your iMac and a functioning power outlet.

Â Press the power (®) button and immediately hold down the Command (x), Option,

P, and R keys until you hear the startup sound a second time. This resets the

parameter RAM (PRAM).

Â If you recently installed memory, and your iMac sounds tones every five seconds,

make sure that the memory is correctly installed and that it is compatible with your

iMac. Check whether removing the memory you installed allows your iMac to start

up (see page 42).

Â Unplug the power cord and wait at least 30 seconds. Plug the power cord in again

and press the power (®) button to start up your iMac.

Â If you still can’t start up your iMac, see “Learning More, Service, and Support” on

page 57 for information about contacting Apple for service.

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Apple iMac (27-inch, Late 2009) Specifications Page 46