Just installed Mountain Lion, and my Mac won't boot correctly. What should I do?

So I stupidly decided to "upgrade" to Mountain Lion this evening. I downloaded ML, installed it, and now whenever I try to boot my Mac I can't get anywhere. The apple logo comes up and the spinning wheel below it starts up, but then it stops and restarts itself over and over again. I can boot in Safe Mode and I have verified the disk and the permissions (there were no issues.) Any suggestions on how to get it to boot normally? If it helps, I have a 2011 Macbook with 8GBs of RAM. I did have Snow Leopard before I tried upgrading to Mountain Lion.
Also, on a side note, I have my original install DVDs that came with my Macbook... if nothing else works, can I use these to revert back to Snow Leopard? I don't care if I have to clear my entire computer, I have everything I need backed up (and not through Time Machine. I just have the files I want.)

Have you checked that all your apps are compatible with Mountain Lion? Check that the apps are supported > http://www.roaringapps.com If you have apps that aren't supported, start in safe mode and uninstall them. Then, restart and see if Mountain Lion starts properly.
Another thing you can do is to reinstall OS X again. To do it, hold Command and R keys while your computer is starting and reinstall OS X.
xSarabean wrote:
Also, on a side note, I have my original install DVDs that came with my Macbook... if nothing else works, can I use these to revert back to Snow Leopard?
Of course. You have to erase the hard drive and install Snow Leopard on your hard disk, but first try to solve the problem with Mountain Lion

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    Mid-2010 15" MacBook Pros - the bad NVIDIA GPU
    If you're having frequent kernel panics with your 15" mid-2010, or intermittent screen problems, the problem is, more than likely, the faulty NVIDIA GPU found in a number of those machines.
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