iMac won't start after attempted reinstall

Discussion in 'Mac Basics and Help' started by rahinco, Mar 26, 2013.

  1. macrumors newbie

    Nov 8, 2009
    My 2009 27" iMac will not boot up. I was trying to wipe and reinstall the operating system (mountain lion) but it ask for a CD which I didn't have, so I turned it off meaning to try again later.

    When I turned it back on, it no longer returns to the install prompt, just the greyed out no entry symbol.

    I tried putting a Snow Leopard CD in but it had no effect and the CD is stuck inside now.

    I've also tried holding down some key combinations I googled, but those had no effect either.

    Any idea what I can do about this?
  2. macrumors P6


    Jan 23, 2005
    So you had ML on there and tried to reinstall?

    Try holding the command-r keys both down when you boot. That should get you to a recovery screen and from there you can reinstall.

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