Hi will1384
First Thanks for you reply.

Yes, i tried EFI Studio and i choosed GeForce 8600 GT 512MB from the list and after that i restarted the laptop and booted with -v(and-f) and also started again normally and in all cases what i got is just black screen. the computer is running but with black screen (no mouse pointer shown).

so unfortunatly EFI studio did not work with me.

Also i tried to use ox86 Tools Utility by trying to add EFI and i choosed my card but when i tried to save i...t it gave me this message:
/bin sh not exist

any thoughts.