Unable switch on iMac What should I do?

Hi
I am unable to switch on my iMac When I turn it on I get the Apple symbol and the small spinning (non-coloured) wheel. I am unable to start it in SAFE mode. I switch it on and then hold down shift key (aftr hearing start sound) but I believe that my wireless keyboard is not connecting.
Any help appreciated
Thanks in advance
Rick

Where you're stuck is in the gray screen with the apple logo right?  There are several reasons why that's happening.  If you have accessories or other peripherals connected in your iMac, remove all of them and try to start it up again.  That way we can isolate if a peripheral is causing this issue.  Another is by starting your Mac in Safe Boot.  But since you have already mentioned that it still wont turn on after trying this.  Next is try to reset your computer's PRAM/NVRAM. 
How to reset PRAM:
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Immediately press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.Continue holding the keys down until the computer restarts, and you hear the startup sound for the second time.
Release the keys.
Your wireless keyboard is not connecting?  Did you try to change the batteries or remove and put the batteries back? Most of the time this works.
I hope this would help you with your Mac's issue.

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