When I boot up my iMac I get a black screen with white text?

Hey guys wondering if anyone can help me. I installed mountain lion on my iMac the other day (2.8ghz Intel Core 2 Duo, 24inch) and now when I turn it on I get this screen come up? Any one no of a way to fix it? It comes up black all this white text appears and at the end it says..
"If you wish to boot the system:
exit
:/ root #
You type exit and some more stuff comes up then the mac boots up, normal apple loading screen and your in?? I tried reinstalling mountain lion again and I had no luck. Still doing it? Its strange cause ML is running fine on my macbook air. If anyone has any suggestions I would be so grateful. Tell me this isnt the end of her?
Its not something silly like the keyboard and mouse aren't connecting? I leave them on all the time.
Heres a snap of the screen
Thanks everyone

I did reset the PRAM, but don't think that worked.  I did find this on a blog on the web.  It worked for me
When I first read this post I did not realize that the Mac boots properly if you type "exit". It seems like perhaps your mac thinks you want to boot in "verbose" mode. Try this before doing a reinstall.
http://www.ernieflores.net/osx-page-3/always-boot-mac-os-x-in-verbose-mode/
I got this info from here
http://www.mac-forums.com/forums/os-x-operating-system/280859-black-screen-white -text-startup.html
note: after it starts with the white text and black screen just type exit then hit return key and the computer will startup.  open the terminal after that and follow the ernie flores blog tip.

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