27" Retina iMac dead

Less than one week old, my 27" Retina iMac is… dead!
I put it to Sleep a few hours ago, and returned to find that I could not wake the machine. Screen trouble? Pressing the Power button, to turn it OFF, and pressing it again to turn it ON produced NOTHING. A black screen.
Checked the power strip (other devices are powered ON)…  checked the U.P.S. (lights are ON)…  tried a wired keyboard and mouse (no change)… Nothing works.
I hardly know this machine yet. Should there be a tiny LED light somewhere, indicating whether it's receiving power? (There is no LED to be seen.)
Has the screen died on me? The power supply? Something else? I am out of ideas.
Luckily, I have a nearby MacBook Pro, to let me post this Question.
TIA.
John Lincoln

Me again. Turns out that the problem of a "dead" 5K Retina iMac (unable to Wake from Sleep) might be a common problem.
I just got off the phone with Apple Support (800) 275-2273. I told the Tech that, when put to sleep, the iMac won't wake up without UN-plugging the machine, and plugging it back in. He said this is the same as re-setting the SMC (System Management Controller) on this model — which is accomplished by UN-plugging the computer, waiting 2-3 minutes, and re-plugging it back into the electric socket. That's it.
And he told me that the problem appears to be caused by having a particular setting checked in: System Preferences > Energy Saver.
The solution is simple — just UN-check the option:  "Put hard disks to sleep when possible".
I've only been flying with this "fix" in place for a few hours, but Sleep-Wake-Sleep-Wake seems to be normal, and functioning well.
Using OS X 10.10.1.
If this is your problem, give it a try.

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