Help needed on start up

Hello all... I seemed to have done something very bad to my iMac.  When I start it up 3 images flash repeatedly and there is no way for me to start any work on my computer.  The 3 images that flash are the apple logo, a prohibited symbol, and the file folder with the question mark on it.  I have tried the startup holding down the control key, see the startup disk, bu when I click the arrow the system runs through the 3 symbols again.  Eventually the process stops on the file folder.  I realize I may need to bring the computer in to a store, but I thought I would throw the question to the masters first.  Any suggestions?  I will admit that I deleted the library folder, only because it was duplicated.  I realize that this is probably the reason this is happening, but if anyone can assist me in restoring the library folder (even though there is already one on the hard drive) I would appreciate that as well.  Anything helps.  Thanks to all...

Yep.  Figured.  I was running Mountain Lion (pre-mavericks).  So, what to do, what to do? 
I thought since the library was duplicated I'd be good.  Never thought that this would be the result.  Do I bring it to an Apple store, or sell it as scrap?  I do have an external hard drive that has been backing up, so we're good there.
Thanks!

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