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iMac frozen after upgrade from Tiger to Leopard - only shows a blue screen with the mouse pointer...how can I un-freeze it??

After I upgraded my iMac from Mac OS 10.4 to Mac OS 10.5 it doesn't start properly anymore. It boots with the sound and the apple and then instead of going into the "desktop mode" only shows a blue screen and the mouse pointer.
How do I go back or otherwise boot the iMac so I can get to my data???
Is there a safe mode or something??
Help PLEASE!
 
sad I’m extremely frustrated!!
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