Why did my MacBook Pro stopped working

Hey,
Yesterday my MacBook Pro stopped working (got stuck on the opening screen with the spinning wheel)
I fixed it..but my question is what made it do this?
Thanks,

Oh - your profile shows 10.8 - which is Mountain Lion.
There's no telling what could cause a one-time event like that - could be any number of things - but if it happens again, call back.
Clinton

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