Hello,

Safeboot will not work until AppleINtelCPUPowermanagement.kext is there.

U have to boot into Singeluser ( Bootoption -s ), thene mount your HDD and delete the Kext per Commanline.
Then reboot using -f -v ( Dont know what -F does )

Ah and yes, u can also use the Install DVD and the use the Terminal. Or a Linux Live CD or something.