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The first sentence you wrote is unclear. What exactly is the issue? And what exactly happens when you at tempt to turn on your Imac?
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.
It could be that your keyboard is failing and needs to be replaced. But first, lets make sure that your keyboard settings are correct.
If you follow the steps on this link, make sure you have US / Qwerty selected.. ( And not US Dvorak)
If the keys still dont work, you may want to consider replacing the keyboard http://amzn.to/29ARIw9
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.
Hello again. I havent heard back from you since you viewed my reply. Did you still need help with this issue? Please respond so we can discuss the problem further or close out the question.