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Mar 6, 2016 9:33 AM in response to Melanhedby den.thed,A stock 2007 iMac only came with 1GB of RAM and the newer OS X version like Mountain Lion require at least 2GB of RAM.
The RAM in your 2007 model is upgradable.
see > Install memory in an iMac - Apple Support
To purchase reliable RAM from trusted suppliers, visit macsales.com or Crucial.com