Macbook Pro freezing on boot up and ran out of methods to fix it!

My Late 2011 Macbook pro has recently started acting up. Freezing on normally fine applications and bogging down to a hault. Now my macbook won't even start up. The progress bar is currently at about 50%, and that took about an hour. Its been running for 4 hours with no movement at all. It kept stopping at 50% every time I restarted it so I did some googling and tried to fix the issue.
Here is what I have done so far:
Verified and repaired the disk and permissions.
Reset PRAM
Booted into single user mode and used the fsck -fy command
Booted into Apple Hardware Test
** No problems reported by any of the above methods the hardware tested OK for all of above.
**I also tried to boot into safe mode, but it still got stuck on startup.
Macbook Pro Specs:
Model: Late 2011 13"
Ram: 4GB
HDD: 720GB
Processor: Intel Dual Core i7
OSX: Yosemite (Not sure which version came on it when I bought it)
I even reinstalled OSX Yosemite and the problem still remains.
If there is anymore information you need that can help fix this issue, then please let me know.
If anyone can help me fix this problem I will greatly appreciate it.

Try running an Apple hardware Test:
http://support.apple.com/en-us/HT201257
Note that an error free AHT is not definitive.
Ciao.

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Macbook Pro freezing on boot up and ran out of methods to fix it!

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