Grey screen fix ??

I'm trying to fix the Grey screen issue on my Mac book pro.  I have started it up using command"R".  I tried reinstalling Mac OSX but there is not enough space required.  There is only 49.4 mb available.
I then went into disk utility and started verifying disks.  The volume Macintosh HD was found corrupt and needs to be repaired.  My pictures I have stored are the most important thing I do not want to lose.  By doing this repair disk will I risk losing these?  Our ifs there a way that I can plug an external drive in now and save anything before it's potentially lost?

I Am sorry for the typos. Typing this on an iPad, the auto save will not let me go back and edit.

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  • How do I fix grey screen with ? Mark Blinking

    Please help me to fix grey screen with ? Mark blinking thanks

    The support article linked below is somewhat outdated. Where it refers to starting up from an installation disc, you should instead start up in Recovery mode.
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    My MacBook Pro shows a grey screen when I try to login and won't go onto my homepage. Why has this happened and how do I fix it?

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