MacBook Pro won't boot up past the Apple logo! Help! :(

I had to force the computer to shut down as it refused to force quit.
I Have tried everything I can (Disk Utility - Repairing the disk.. even though the results came up as OK.. Ive re-installed Mountain Lion..) and had no luck!! The grey screen with the Apple logo and spinning wheel just stay there!
Also, it refuses to go into Safe Mode, after holding shift the loading bar only loads up to almost half-way and then it disappears.
Please help!! 

I'm having the same problem with my macbook. Apple logo and spinning wheel.  I saw a video on youtube that said to reset prm and also to remove both sticks of ram and trying to boot one stick at a time (due to problem possibly being caused by faulty ram) I also tryed booting from disk and booting from safe mode, but everything has failed.  All I get is the Apple logo and spinning wheel.  Does this mean the hard drive has failed? Or is there another fix that I might try? If it is the hard drive it would suck, but I could go buy another one and replace it, but what would really suck is if it wasn't the hard drive to begin with.  Can anyone please help?
Thanks....

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