Thanks, I'll try it!
But first, the AppleIntelCPUPowerManagment.kext problem came back! I get Kernel Panic.
I didn't change anything... Only installed 10.8.1, but I've booted normally after that.
What could it be? I've flashed the BIOS, and everything worked properly couple of min. before this started.
Thanks for helpers!
EDIT:
Booting
I'll now try the guide you gave
And I think the brightness is low...