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Manual abstract:

If the computer "freezes" during startup or you see a flashing question mark: m Make sure both ends of the power cord are plugged in securely. Make sure the power cord is plugged into a working electrical outlet. m If your computer is plugged into a power strip, make sure the power strip is turned on. If that does not work, reset the computer's PRAM memory. Turn off system extensions. m Start up your computer while holding down the Shift key. If that doesn't work, start up using the software install CD. m Insert your software install CD and start up while holding down the C key. (Make sure the Caps Lock key is not engaged. ) Then do this: After the computer starts up: m Start up the computer and immediately hold down the Command (x), Option, P, and R keys until you hear the startup sound a second time. After resetting PRAM, you may have to reset the settings in some of your control panels. If that doesn't work, or if you hear several musical tones during startup: m Make sure that the hard disk that contains the System Folder is selected in the Startup Disk control panel. m Choose Mac Help from the Help menu. Look at the section on how to prevent and solve problems. You may need to check for extension conflicts or reinstall your computer's system software. If you notice that the background picture is different: m You probably started up your computer using the system software on a CD instead of your hard disk. If this is the only way that you can start up your computer, reinstall the system software on your hard disk. Look for instructions in Mac Help or use the Installer application on your software install CD. m If you recently installed additional memory, make sure that it is correctly installed and that it is compatible with your computer. m See the service and support information that came with your iMac for information on having your computer serviced...