Maybe you're referring to something else but the Mac does a hardware self-check each time it boots up. So if you do a shutdown (not sleep) and then bring it back up, when you hear the startup sound that means the hardware check passed. More info here:

http://en.wikipedia.org/wiki/Macintosh_startup

CB

On 12/2/13 8:43 PM, don bishop wrote:
Hi,

Seems to me I remember reading somewhere that the imac will do a check of the 
system automatically.  Is this true?  If so is that on by default or do you 
have to set it up.  If so, where do you do this?

Thanks,

Don


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