Yosemite stuck at Installation reboot. Multiple Reboot did not help.

So I updated, (tried to update) my OS to Yosemite. Took me about 4-5 hours to download it, then when it prompted me to restart for the installation reboot. It got stuck at 50%. I left it, went to bed, went to the office, came home to find it still at 50%. Got fed up so I forced restart it and when it restarted it went back to the same white page with the apple logo and the progress bar, when it reached to 50% it got stuck again.
As of currently I have rebooted (forced restart) more that 10X but the same thing happens, soon as it reaches 50% it's stuck.
I tried to do an NVRAM?PRAM? reboot (Command+Alt+P+R) - no effect.
Help, I dont know what to do, I haven't used my laptop in more than 48 hours and I have deadlines.

If this started happening without your having made any changes and without a warning of low disk space, then it's likely that the startup drive, or some other hardware component, is failing. Back up all data immediately, then make a "Genius" appointment at an Apple Store to have the machine tested.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.

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Yosemite stuck at Installation reboot. Multiple Reboot did not help.

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