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Hi! I am Justin. Let me take a chance to look over your question. If you have any additional details please type it in and hit the reply to expert button.
Reboot and hold down CMD + R and let me know the result.
Right on. They are super. I worked for Apple as a Genius for many years. If they cannot help I am more than happy to continue with you.
They are likely going to have you do a reinstall of the OS. The could walk you through single user mode, but it is hard to say. Some times the file system does get corrupt. It is not common, but it can happen.