Display no longer working

Hi All
I have a brand new iMac 27.5". The following problem arose:
- working on Safari
- Safari disappeared suddenly
- Safari application no longer on dock
- display turned a darker shade
- dialog box indicated to press down on power to shut off computer and press once again to restart
- now computer no longer starting!
Any idea what the problem is? Thanks a bunch.
- PK

Thanks.
Were there any other apps running in the background?
Just Pages.
Were the fans running high? Was it hot? Were you indoors with AC?
Not really re fans. Yes, a bit hot. Yes, indoors with AC.
Was it bumped?
No.
When you say "won't start", you mean, no power, or power+grey screen or...?
Display is blank. Cannot tell if there is any power being drawn.
If it's not starting at all, it could be one of the fail-safes kicked in (motion or heat). Let it rest for an hour and restart it.
Yes, not starting at all. Have left for several hours, but no luck.

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