Mac won't start after update to Yosemite

After updating my MacBook Pro 13" to Mac OS X Yosemite, it became so slow (only went to the Apple Community after this problem and found other users experienced the same) so I restarted it. Because restarting, too, took a while, I shut it down by holding down the power button instead. Now, when I boot my Mac, it shows the Apple logo with the progress bar but it goes up to about one-fourth progress then shows an error/stop icon. Can't get through the login screen. How do I fix this?

Solved by going back to 3.5.10. All settings and bookmarks came back. Won't be upgrading again anytime soon - or will be switching to Chrome!

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        Size:         350971142144 B (351.0 GB)
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            Conversion Status:       NoConversion
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            Has Encrypted Extents:   No
            Fully Secure:            No
            Passphrase Required:     No
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                Revertible:            Yes (no decryption required)
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              40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
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