MacBook Pro refusing to startup no matter what I do

I have a MacBook Pro — as per specs below — and it has decided not to complete a startup. The way it happened was I restarted my computer to boot up into Windows then later on I used the Boot Camp system tray icon to restart into OS X, or at least that was the plan.
On startup everything went fine but it got to the blue screen and then the little activity circle-animation began to play. It would play for a few seconds, disappear, then do it again. It should also be noted that it was doing this for at least 10 minutes.
I have tried all of the following (though not in this order):
1. Resetting SMC.
2. Resetting PRAM.
3. Repairing the disk.
4. Repairing permissions on the disk.
5. Starting up in Verbose Mode.
6. Starting up in Single-User Mode.
7. Starting up in Safe Mode.
One thing of note is that while in Verbose Mode it kept looping while trying to get the proper date and time, which was incorrect as it always in when I restart from Windows.
Also, after that first attempt the only time I made it as far as the blue screen was after I went back into Windows to change the time zone — one was set to the East Coast and the other to London time — but other than that I get to the Apple logo on the grey screen with the circular animation. I've let it sit for 15–20 minutes and it doesn't go anywhere.
I thought that since it was a time issue I could reset the SMC and it would fix it but doing so seemed to have absolutely no effect, which made me wonder if I did it correctly even though I followed the documentation.
I'm saving reinstallation as a last result as I don't have any file backed up and I don't want to lose them.
Does anyone have any suggestions?

I don't have my copy of DiskWarrior with me but a friend had a copy of Drive Genius which allowed me to build the directory. I got back to the blue screen but after seeing the mouse for a second in the top-left corner it went back into the loop of showing then not showing the circular animation.

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