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oops somehow I pressed on command and S right after I turned computer back on... and this came up.. at the end it says

"if you wish to boot the system:
exit"

":/ root# "

I am not sure what I should do next?



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ok I read the link.. I pressed and hold on command option p r and let go after the second sound after the startup, now the screen is blue....
 
couldn't click on "repair disk"

check - Restart the computer, then hold the C key during startup.



check - From the Utilities menu, choose Disk Utility. Don't click Continue.



check - Select your Mac OS X disk (named "Macintosh HD" by default) in the left side of the Disk Utility window.



check - Click the First Aid tab.



NOT ABLE TO CLICK ON "REPAIR DISK" - --- Click Repair Disk to verify and repair any issues with your Mac OS X startup disk.
After repairing the disk, try to start up normally.
 
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