How to 'reset' Mac Book Air?

My Mac Book Air is instable, permanently< asking to restart. Its in a loop. What I need is a kind of Secure Mode start up. Repeatedly pressing power off for several seconds brings the same error message, that Mac OS wants a restart. Urgently need advise.
Thanks.
Al.

Try booting up in [safe mode|http://support.apple.com/kb/HT1455] and see if you get the same message.
Steve

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