IMac boots to a black screen and shows blinking square cursor on top left

iMac boots to black screen and then shows flashing white square in the top left of the screen. After a few seconds an error message - i assume appears.
disc0s2 oxe0030005 undefined appears.
Does anyone know what this is?
Can view HDD using firewire
Can load diagnostic disc and run diagnostics with no errors

The disc0s2 should be your OS X boot volume. Have you tried starting from the Install DVD1? Start from the DVD and when you get to the OS X installer go to Disk Utility in the Utilities menu and select First Aid. Choose the top drive in the left hand column and repair. Repair as many times as necessary until no more repairs are reported. Quit Disk Utility. Then go to Startup Disk in the Utilities menu and choose the OS x volume on your Mac and restart.
Let us know what happens.

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Hello cncprogrammer,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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Please re-post if you require additional support. Thank you for posting on the HP Forums. Have a great day!
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Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
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IMac boots to a black screen and shows blinking square cursor on top left

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