Can't install Mountain Lion..

[melle721]

Hello,
i have tried to install Mountain Lion on my PC:
i7 2600k
Gigabyte GA-Z68XP-UD3
Radeon HD 7870
500GB 7200.12 and 2000GB 7200.14 Seagate Barracuda HD
8GB 1600 RAM

Well, now i have bought Mountain Lion over my Mac Book Pro, did all the stuff with UniBeast, took my GPU out of my PC, and so far everything works.
I can boot onto the USB Flash and the setup starts. But in the Disk Utility i just see my USB Flash, i cant see any of my HDs.
I have tried a bunch of things with installing kexts with KextWizard, but i didn't really know what i was doing and nothing worked.

Now i have looked through a lot of posts but i cant really find a solution.

Can anyone help me?

 

[rdunseith]

Which drive are you installing to? And do you have quickboot disabled in Bios?

 

[melle721]

I'd like to install to the 500GB one..
Yes, i have Quick Boot Disabled

 

[rdunseith]

Which SATA port do you have it connected to?

 

[melle721]

Its connected to SATA2_2, which is the first SATA2 port

 

[rdunseith]

Does Bios recognize your hard drive? Also check to make sure AHCI is enabled.

 

[melle721]

AHCI wasn't enabled... Thanks!
Can you maybe give me a few hints how i get everything fully working now?

 

[melle721]

Ok.. i am lost now..
i have finished installing everything, now i have put my 7870 back in, changed the stuff with onboard graphics in the bios, booted and it works.
But the main screen is always the one which is connected to the motherboard.
How can i fix that?

And also Multibeast ist always failing to install, i have copied everything from the USB to a partition (Just tried, i can't boot from that).
I have already used KextWizard to fix right, and i cant even install a DSDT with Multibeast..

And i also can't log in to App Store.