Apple IMAC User Manual - Page 313

8 Chapter 1 Computer won't shut down. Try this solution: m Force your computer to shut down. (p. 13) Single icon appears in middle of screen Icon with blinking question mark appears. Try these solutions: m Make sure external devices are properly connected and turned on. (p. 14) m Re-bless the System Folder. (p. 16) m Resolve system extension conflicts. (p. 17) m Reset the PRAM. (p. 19) m Test and repair the hard disk directory. (p. 21) m Reinstall system software. (p. 21) Icon with X appears. Try this solution: m Make sure you're using the correct disk as a startup disk. (p. 16) Computer beeps Try these solutions: m One or two beeps: Make sure memory is installed correctly. (p. 20) m Three, four, or five beeps: Contact an Apple-authorized service provider. See the service and support information that came with your computer. Computer freezes Computer freezes before "Welcome to Mac OS" appears. Note: Startup may take several minutes if you have more than 32 megabytes (MB) of RAM installed because of the time it takes to verify that the RAM is functioning properly. Try these solutions: m Take notes. (p. 11) m Make sure external devices are properly connected and turned on. (p. 14) m Force your computer to restart. (p. 12) m Test and repair the hard disk directory. (p. 21)