New iMac 27 startup problems

Hello Support,
I've recently bought a iMac 27, some months ago, and all of a sudden it takes - hold onto your breath, more than 1 hour to start up.
I've been using disk utility and done whats to be done. It still takes forever.
It's got this grey screen with this spinning wheel on it when it's starting up.
What can be done. I've been looking for S.M.A.R.T in the info panel in disk utility, but I cannot find this S.M.A.R.T
I'm wondering if it's a hard disc failure.
Best
EuropeXL

Hello Paul_31,
I followed your suggestion and contacted AppleCare.
It took approx. 15. minutes and I was guided through what to do. I restarted my Mac and it works just fine again. I have to credit Apple for some first class support. After I contacted Apple on the net, and till my phone rang took about 15 seconds. I kid you not!!
And I want to give you some credit as well. You were right:
"but have you checked the hard disk using the Recovery HD? Restart holding down Command + r and select Disk Utility and click on Macintosh HD and the 'repair disk".
That's what AppleCare suggested and guided me through. I was told that my harddisc seemed ok as I didn't get a S.M.A.R.T negative feedback.
I've been checking about this Mac and I can see that I've been reversed to Version 10.8.3 however.
Maybe there's an issue with Version 10.8.4 slowing down your Mac.
Now it takes about 10 seconds to startup. Before it took 1 hour and 8 minutes!! I hope Apple will look into the Version 10.8.4 if there's an issue about slowing down the Mac.
However hanx again for your help.
Best
EuropeXL

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