Thank you very much for your answer!

I gave busratio=19 because i have overclocked my CPU to 3800MHz.
I put back my CPU to the default clock (3400MHz) and i gave the busratio=17 kernel flag, but still no luck (sbin/launchd failed kernel panic). This with the following kernel flags: -legacy -v arch=i386 npci=0x3000 (or npci=0x2000) busratio=17.
When i boot only with -v, i am stucked in the USBF "AppleUSBOHCI::CheckSleepCapability - OHCI Controller will be unloaded across sleep" .
What other thing i must check?

Thanks again!!