Blue screen after powering, scoped the forums, tried out all the suggestions, no luck

g-shock

macrumors newbie
Really need your help guys!
Blue screen after powering
Imac alu, SL 10.6.8

Failed methods so far:

-repair disk permissions via external system or install DVD, no luck
-->message "Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent" has been modified and will not be repaired."
i know that Apple says the message can be ignored

-unplugging the imac of every peripheral device as well as power cord,
holding down the power switch for 10 sec.

-doing p-ram reset

-booting in safe mode, blue screen-->loading circle+blue screen--> no loading circle + blue screen---> loop phenomen

Do have any other suggestions?
When booting from an external hard drive, the icon of the internal hard drive on the desktop has got a lock now. Do you know what to make of that?

Thanks,
G.
 
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