HT5313 When trying to install the os x 10.7.5 update, all i see is a blank grey screen and nothing happens! It's supposed to  install then restart, any clue as to why this is happening?

When trying to install the OS X 10.7.5 update, all i see is a grey screen with the software bar on top, nothing happens,it is supposed to install then restart! Any clues as to why this is happening?

The startyp disk may need repairing.
Restart while holding down the Command + R keys.
Instructions here >  OS X: About OS X Recovery

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