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I'm sorry--this sounds frustrating.
Can you access the Terminal app (found within the /Applications/Utilities/ folder), or search for it by pressing Command-Spacebar? If so, try typing this in after opening Terminal and pressing enter:
If this works, let me know. If it doesn't, get back to me and we'll try something else. Please let me know, in this case, if you still have the OS X install DVD for your version--and a working DVD player?