24" iMac Blue screen at start up. Dock appears but cannot open Finder.

Error -10810 "The application Finder cannot be opened".

The fact that you can neither boot into sfe mode or from your startup disc tells me that you're probably holding the keys too early or late. Lets go back and try to start up in safe mode again http://support.apple.com/kb/HT1564?viewlocale=en_US
Press the Shift key immediately AFTER you hear the startup chime. Startting in safe mode deletes some temporary files that should allow you to get into Finder.

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  • Blue screen on start up. Safe mode not working?

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