Suddenly my screen gets black !!

Hi everybody,
I have a problem and a question.
Some time ago my iMac screen got black suddenly, then I pressed the start buttom during a while, the computer restart its activity and the screen was normal again.
Now this issue happens frequently.
Why does it happen? is it serious?
Thank you in advance
Sun

This may help.
1. Start up in Safe Mode.
    http://support.apple.com/kb/PH11212
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the appropriate method.

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