My mac won't turn on. It has the apple sign but a little loading sign under it, for about an hour

My mac won't turn on. It has the apple sign but a little loading sign under it, for about an hour

Will it boot up in safe mode?
http://support.apple.com/kb/ph11212
or can you enter single-user mode?
https://support.apple.com/kb/ht1492
What version of OSX are you running?

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