My brand new iMac will not power up after an update restart, any suggestions?

Any suggestions on why my IMac will not power up after it done a restart?

Try an SMC reset and PRAM reset: https://discussions.apple.com/docs/DOC-3603
If that doesn't help:
See if it will start in Safe Boot: restart holding down the Shift key until you see a grey progress bar, type your admin password when prompted, let it continue to (hopefully) boot. Restart as normal from the Apple menu.
If that didn't help, try booting into the Recovery HD: restart holding down Command+r and choose Disk Utility from the four choices when they appear on screen. Once DU has launched select your Macintosh HD on the left and click on 'repair disk'. If anything gets changed click on repair disk again until you get a clear pass, restart as normal from the Apple menu.
If you still have problems, give AppleCare a call.

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