Tips and Support on Apple Mac Computer Not Booting up

andrew8062 11:56 am on November 3, 2009 | Answers: 1    
Tags: apple (18), boot (9), booting (3), circle (3), computer (64), mac (50), support (14), tips (11)

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• andrew8062 11:56 am on November 3, 2009
  

  Try the following steps:

  • Restart your MAC and hold down the 4 keys: ALT,CMD,P and R and keep them pressed up to the 5th ‘beep’ (the startup sound). Then release the 4 keys and let the MAC and then boot normally.
  • If it does not work, go to step below.

  Repair system files

  For this, you must restart the Mac in “single mode” by holding down the Apple key and S (or Cmd and S, depending on the keyboard) until a black screen with white text appears.

  • When nothing moves make a carriage return to move to a new line starting with:/ root#
  • Now type the command fsck -yf then do a carriage return to run the command.
  • Note 1: case sensitive and spaces
  • Note2: single mode, the keyboard is in QWERTY mode, better make numeric keypad to type the dash character.

  • The process will take a few minutes.
  • As long as the results contains “File was modified” repeat the fsck ?yf command and do a carriage return.
  • Type reboot and do a carriage return
  • The Mac will restart normally.

  Notes

  If this is still doesn’t work, then use the Mac OS X installation DVD/CD and restart the Mac holding down the

  • ALT key to select the CD/DVD as a boot source.
  • A repair disk from disk utility will then be perform.