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I have Mac Pro which is running 10.8.5
After I turn on the Mac, I can see the regular apple logo, but after it's disappear, I see white screen (whiter than before) and a loading wheel for a few seconds, and it's disappear for 3-4 seconds and come back again.
And It's continue like that forever.
I suspect that start to happen after tried to attach my second monitor to my graphics card at the mini display port.

Things that I've tried so far:
Safe Boot - can't reach to it.
Reset PRAM - same results.
Running fsck –fy at single-user mode - same results.
Repair Disk - same results.
Repair Permissions - not clickable.
Reinstall Mac OS X - I get an error message "this item is temporarily unavailable"

Is there anything left for me to do?
I really hope that I won't have to reinstall everything from scratch, because I have a lot of stuff that I need on my SSD (the one which is running the OS X).

  • Try "Verbose Mode" - hold Command-V while booting and see if you can capture the output on a smartphone and paste it here. – Allan Mar 5 '16 at 11:43
  • @Allan What exactly do you want to see there? All the text in there disappearing pretty quick, And there is sort of 1-2 different screen of it. – Hashirama Senju Mar 5 '16 at 11:48
  • That will give us an idea of what is being loaded, what errors are being generated (if any) and what is happening prior to it crashing and rebooting. If you have to, take a video and share it on DropBox or something similar. – Allan Mar 5 '16 at 11:55
  • I can't make any of the text out, but your computer is booting, it's just crashing on something. Try running Apple Diagnostics - see: support.apple.com/en-us/HT201257 Can you update your post to include your Mac Model and year? – Allan Mar 5 '16 at 13:15
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How did you repair your disk? I did it through command line and it helped. This topic might help.

  • Like I've said before, I already tried all of those options and it didn't work very well. – Hashirama Senju Mar 16 '16 at 6:10

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