I have just installed 10.5.2 R1 on to my pc, booted the installation in safemode and everything went smoothly. Rebooted without dvd in drive and boots up just until it moves to the operating system and i get a weird screen with black and white artifacts.

Reboot in to safe mode and i get proper graphics... or so i thought.

Checking whats installed i noticed that the kexts for my graphics aren't loaded, the ethernet isn't working so i guess the same theory could be applied to that, as well as the sound!

I repaired the permissions on the drive but still get the same when i try to boot normally.

When i boot up in safe mode, each time i get an error stating "natit.kext was installed improperly and cannot be used. Please try reinstalling it"

^^I'm guessing this is a big clue as to whats wrong?

I checked all the appropriate options at the install for my hardware (sb600 kext/ac97 audio/2600xt).

I've also looked in to the extensions folder and they do appear to all be there (maybe because its safe mode?).

Little help would go a long way

Hardware:

AMD x64 Dual Core 3800+
HIS HD2600XT 512MB
2gb PC5400
MSI K9AGM2 (sb600 chipset)
250gb Hitachi Sata