IMac - freezes or pauses intermittantly - usually for 2 or 3 seconds no matter what program is running - sometimes just touching a menu to get a drop down will take several seconds

my iMac freezes or pauses intermittantly - usually for 2 or 3 seconds - no matter what program is running - sometimes just touching a menu to get a drop down will take several seconds - if playing music on iTunes or Spotify the music will pause for several seconds - it is not internet related because it happens when working off line - its become a major annoyance in using the compuetr - really slows it down - any suggestions?

Run the Extented Apple Hardware Test from the original system disc that came with your iMac, as per > Intel-based Macs: Using Apple Hardware Test

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    Revision: 1384
    Author: [email protected]
    Date: 2008-04-24 07:54:58 -0700 (Thu, 24 Apr 2008)
    Log Message:
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