Mac freezes on the apple startup screen?

My iMac 24 inch freezes on the apple startup screen, then it takes along time for the cog wheel to start turning, and then that's all you'll get untill you switch off. I've fixed permissions and erased and reinstalled but still same issues, any ideas for what to do next????

If you can afford to erase everything again...
  1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
   2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
      *Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
   3. Click the Erase tab.
   4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
   5. Select your Mac OS X volume.
   6. Highlight the drive, select Partition Tab, then Format type... MacOS Extended Journalled, select the Security Options button, choose Zero Out Data, Erase... after completion hopefully you'll be able to get a good install.
Or...
Boot off your *original* Install Disk while holding down the *d key*, (not c key), then run the extended Apple Hardware Test. Some disks require you to use the Option key at bootup to select AHT.
The Memory test can really only be trusted if it finds a problem, not if it doesn't find a problem.
Memtest OS X...
http://www.memtestosx.org/joomla/index.php
Rember is a freeware GUI for the memtest ...
http://tech.kateva.org/2005/10/rember-freeware-memory-test-utility.html

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