Thanks Everybody for responses !
And Thank You Fire (i think you have AM2NF3 Motherboard too XD)

But I have a problem and this is the reason of the topic :

i can"t boot with -s or -x or any combinaisons ..... even with this you gave me fire : "Graphics Mode"="640x480x32" ....

i have the same problem with this ... (see http://img329.imageshack.us/my.php?image=photo020jg8.jpg
and http://img443.imageshack.us/my.php?image=photo021sw7.jpg )

I think that OSX HATES this motherboard (AM2NF3) don't you ??

thanks !