Will not boot - Blank Gray Screen - Help!

I was trying to use Boot Camp to partition my new iMac to allow a small several Windows Applications. Followed (I think) online instructions including reformatting. When it looked like it was repeating the "formatting" I hit cancel figuring I would stop the partitioning and get advice......result was iMac shut down and now when I start I get the chime and a plane gray screen with no option to access or reboot. I tried PRAM (opions-control PR) and that did not get results......not sure what else to try.

Timetraveller wrote:
Hi Again Nerowolf and thanks for your help and patience.......sorry don't know the John Titor you mentioned.
Google "John Totor"
But I did try the DVD and holding down "C" while rebooting and while there was some hopful clicking no result. Do you have other suggestions.......am wondering if a trip back to the store might be a good move!
I suspect a hardware problem. Back to the store sounds like the appropriate thing to do.
Booting from a DVD has very little to do with the computer OS.
But first - do this, Sometimes it does miraculous things:
■ Shut down your computer. Turn the computer back on and immediately hold down Command-Option-P-R, continuing to press until you hear the startup sound for the second time. This resets the computer’s parameter random-access memory (PRAM).
IMPORTANT: Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
■ If resetting PRAM doesn’t solve the problem, reset non-volatile random access memory (NVRAM). When the “To continue booting ...” message appears, type “reset-nvram” and press Return. Then type “reset-all” and press Return.
Post back the results.

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