You need to boot in to recovery, it won't let you erase the drive it's booted 
from, the best thing to do is to boot in to recovery using command+r, then use 
disk utility to erase the drive, and finally choose to reinstall your operating 
system. That will give the mac a fresh start.
On May 7, 2014, at 12:50 PM, Deb Lewis <deblewi...@gmail.com> wrote:

> Hi:
> I'm returning my MacBook Air to myoffice and need to reformat it
> first. I went into Disk Utility and selected Erase but everything is
> greyed out even though I've selected the drive etc. I'm obviously
> missing some steps, LOL. I know this should be doable with VO because
> I think I've seen it happen before, but as I said, I'm obviously not
> quite getting it right since no options are available.
> Thanks in advance for any help.
> 
> Deb
> 
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