IMAC 21.5 " allinone will not boot after OS re-installed

Had to erase HD and re-install Snow Leopard from installation disc.  It completed OK but sys will not boot, tone sounds and Apple logo comes up and 'wheel' is spinning, but that's it.  Waited for over half hour before shutting down. Thanks for any help anyone can provide.

Try a safe boot by holding the Shift key down between the startup tone and logo.
If succesful, go to System Preferences > Startup disk > select your HD and restart.

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