Cannot boot computer past apple logo, text is displayed saying aDebugger called panic ?

Hello
I have been having issues booting up an iMac computer, it doesn't get past the apple logo before prodcuing text and a greyed out screen that refers to 'Panics', 'double Panics', kernal traps, deBuggers?
Not sure where to even begin really.
It does the same when I try to boot in safe mode.
Any ideas, can some one show me where to begin?
cheers
Matthew Trott

Post the last KP report. Step one is to boot into safe mode (restart holding down SHIFT key). Also, See
Technical Note TN2063: Understanding and Debugging Kernel Panics,
Mac OS X Kernel Panic FAQ,
Resolving Kernel Panics,
How to troubleshoot a kernel panic,
Troubleshooting Mac OS X Kernel Panics, and
Tutorial: Avoiding and eliminating Kernel panics for more details.

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