HELP! iMac not starting up ... blue screen with folder and blinking ?

my imac is not starting up. when i turn on the computer, i get a blue screen with a blinking folder icon of the finder and a black question mark. i can't move anything or type anything.
i have tried powering down and powering back up with holding down the option key, but all i get is a screen with two buttons with a curved arrow and a straight arrow. however, i can't click any of them!
i don't know what to do and i need major help! can anyone help me? i don't want to spend the $49 again for a simple fix.

For starters, follow the steps in this Apple KB Article Post back if you have any questions or things still don't work out.
Clint

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