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Can you try "diskutil list" in Terminal.app and post back the screenshot?
 
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Warplane95, if you still have my first answer before I deleted it, I think this is the right one.

You can even copy and paste it here, so that some one can confirm or not.
 
You can try doing it in recovery mode. Restart and hold option before the screen comes on, and select the partition titled "recovery". You'll have access to disk utility there. It looks like you still have over a hundred gigs of "free" unallocated space so you should be able to get it back.

If all else fails, you can always wipe the disk and reinstall.
 
I try to enter in the utility with CMD+r at the startup.
Enter in the utility, verifying the disk. Disk was "healthy". Try a repair, change nothing. I'm still stuck in the preparation mode :(
 
You can not expend the HFS partition (disk0s2) because of the Recovery HD (disk0s3).

Your problem could be solved by using the Terminal, but this is far from easy to do if your are not familiar with it.

The easiest way to go is :

- clone your OS X partition to an external hard drive (HFS partition, GUID partition scheme).
Check that the clone is bootable (Alt key boot).

- wipe your internal drive

- clone back
 
Finally, I succeeded.

I erase the disk0s4, unmount it. Resize my partion. Unmount disk0s4 :D now I have all my 500gb :)
 
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