Upgrade to Mavericks 10.9.4 prevents Macbook Pro from booting

It is a 2011 i7 Macbook Pro. It won't boot when powered. Although I just found out that if I unplug the Thunderbolt cable, it does. But I don't want to be plugging and unplugging that cable all the time. I have an external monitor and a CalDigit interface connected there.
Also, starting the computer is so much slower now.
What's the best way to go back, preferably to Mountain Lion. I don't like Mavericks. Only upgrading to update Final Cut Pro, but that was the only reason.
Thanks.

Revert to a Previous OS X
Revert to former OS from Mavericks

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    [EDIT] Duplicate post - please see https://discussions.apple.com/message/22216397#22216397
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