OS X Yosemite will not start, just busy icon

I have installed OS X Yosemite on my MacBook, and now can not log on. I come to the log on screen,.I "log on" and just get a busy icon (rotating circle), and it has been like this for 24 hrs, 2 separate times now over the weekend.
Anyone have an idea for how to get past this. Keep in mind I made the mistake of NOT backing up my data on the MacBook beforehand. Is there a way of reinstalling maybe Snow Leopard and not losing any data, maybe dual OS, and then deleting one? or anything similar?
Thank you

Hello again, vplecko.
Thanks for the update on your issue. Due to the nature of your issue you may find more information by using another one of Apple's support resources - https://getsupport.apple.com/GetproductgroupList.action to get a more hands-on response.
Cheers,
Pedro

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