My iMac has lost colour depth

I recently had to move my iMac some distance, and when it arrived the colour depth had dramatically reduced, so that colours were blocky and text hard to read. I tried altering the colour configuration but nothing made any difference, so I'm left thinking it must be a hardware issue. The computer is a late 2009 21.5 inch iMac.

1. System Preferences >  Flash Player > Advanced >  Delete  All
     Press the "Delete All" button
     Install Adobe Flash Player.
    http://get.adobe.com/flashplayer/
   Download it first. Click Safari in the menubar and select “Quit Safari”.
    Follow the prompts and install it.
    Restart computer. Relaunch Safari.
2.  Allow  Plug-ins
    Safari > Preferences > Security
    Internet Plug-ins >  "Allow  plug-ins"
    Enable it.
3. Safari > Preferences > Privacy
    Press the button “ Remove All Website Data”.

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