What can be done when a MAC refuse to boot and that the main page displays a white backgroung with a circle in it?
Perform the following manipulation.
- Restart your MAC and hold down the 4 keys: ALT-CMD-P-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.
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 primary boot device,
- A system repair from disk utility will then be perform.
Thanks to Ritchi
for these informations!