Apple keyboard not pairing with iMac

My wireless keyboard was working fine just until 2 weeks ago when I went out of town for a couple of weeks (and it has worked fine for over 2 years now).  Now it is giving me problems pairing with my iMac.  I've gone through all the support discussions and I've tried everything. 
I uncoupled the device from the computer because it was not connecting and have tried connecting it ever since and nothing seems to work.  The computer seems to "find" the keyboard but won't connect to it.
I have pushed down the power button the entire time during pairing process as suggested by some people with the problem on the discussion boards and that doesn't do it either.   While occasionally the computer will see the keyboard, it just does not seem to want to connect to it.  The green light comes on for a bit when I hold the power key down (or even when I just push it once) and then goes off.  It never blinks i.e. it doesn't seem like it's going into pairing mode at all.
This is really confounding.  Any help would be greatly greatly appreciated.  I'm already 3 hours in the whole trying to fix this.

Thanks Barry.
I had already deleted the KB from the bluetooth preferences and it was discoverable, so no idea why it wasn't working.
However, eventually what ended up working was that I turned the iMac off, I took the keyboard to work (i.e. away from anywhere near the iMac's vicinity) and then when I brought it back at the end of the day, the green light suddenly started blinking again and the iMac discovered the KB.   I don't know how these things are designed but apparently, you need to take the KB out of the range of the device it was formerly paired with EVEN IF you have deleted the device from the bluetooth preferences.  Otherwise, somehow, the pairing is still remembered and the device is not recognized.
If this happens again, next time, I'll try your reset SMC suggestion.  thanks for your help.

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