My macbook froze up when I put in Mountain Lion disk

My sister just put in the Mountain Lion disk to upgrade her MacBook.  It froze up so she shut down and when she turned it back on she's stuck at the Apple start screen and it won't go anywhere.  Any ideas.....?????

tkensington wrote:
My sister just put in the Mountain Lion disk to upgrade her MacBook.
mountain lion is only available as a download from the app store.

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