Imac non start up

Can anybody out there give me a bit of help please?
At start up my Mac gets to blue screen (with apple) and jumps to grey screen with error msg:
/etc/master.passwd:invalid argument
-sh:/etc/profile:Invalid argument
-sh-2.056#
Used disk warrior, got msg which confirmed that it fixed problem but advises that there is not enough contiguous free space for a fail-safe replacement of the directory and that I should create 127 mb of contiguous free space before replacing the original directory.
Problem is, I'm new to this technical side of things and don't understand 'contiguous free space' or how to achieve it.
Help!

Thanks for the reply. I've already run the repair utilities and it came up with msg that HD needed to be repaired, hence I purchased diskwarrior, and thats how I ended up with diskwarrior giving me the free space msg. Problem though, is that I don't know how to do it. I'm a beginner!

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Google Translate:
Si tratta di un bug nel 10,7 Leone. Quando si avvia il Mac non accendere i dispositivi Bluetooth - tastiera / Magic Mouse / Trackpad - fino a quando il Mac ha pienamenteavviato, o almeno di aspettare fino a quando non ha passato lo schermo grigio.

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Si tratta di un bug nel 10,7 Leone. Quando si avvia il Mac non accendere i dispositivi Bluetooth - tastiera / Magic Mouse / Trackpad - fino a quando il Mac ha pienamenteavviato, o almeno di aspettare fino a quando non ha passato lo schermo grigio.

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Imac non start up

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