Upgrading to GTX660 caused issues

[1v4n]

Everything worked more or less perfect while I had HD6850.

I decided to go back to nVidia for many reasons, one of those was that the GTX660 is stated to be working out of the box in the buying guide (please remove it, cause it's not).

I got the Gigabyte's GTX660 and decided to do clean install, to avoid any issues.

Surprise #1 - KP (turn of your computer...blabla) before the first installation menu, never got that one before.
Tried -x -v -f graphicsenabler=yes, no, etc... nothing.

I pulled the card out and powered the HD3000 on my 2500k. Installation went fine and I rebooted.

Surprise #2 - Stuck on the white loading screen with upper quarter of the screen full with artifacts.
Standard procedure with -x -v -f graphicsenabler....nothing.

BIOS is configured as it should be, everything's is in the same way like it was the last time I installed it.

I am really out of options here so please help.

 

[ninetto]

What version of ML are you trying to install?
You DO know that anything below 10.8.3 will NOT support the GTX660. You have to install using onboard graphics/update first THEN install the gtx660 afterwards.

 

[cochon]

With Nvidia GTX video card, boot flag with GE=No. Human error

 

[1v4n]

I was using Unibeast made on 10.8.3 system. Tried GE=no, same thing.

Installed with onboard but when booting I got artifacts on the upper part of the screen and got stuck loading there (white screen w apple logo)

 

[ninetto]

I am really out of options here so please help.

Ummm, you COULD just put your hd6850 back in(! sorry, couldn't resist)

Three-and-a-half ideas:
re-load optimized defaults in Bios
switch PCIe-slot for the new Nvidia card
set Bios to default to PCIe gpu.
Sounds dumb, but really make sure the new card is sitting right and hooked up correctly to PSU.

Good luck.

 

[1v4n]

Ummm, you COULD just put your hd6850 back in(! sorry, couldn't resist)

Three-and-a-half ideas:
re-load optimized defaults in Bios
switch PCIe-slot for the new Nvidia card
set Bios to default to PCIe gpu.
Sounds dumb, but really make sure the new card is sitting right and hooked up correctly to PSU.

Good luck.

Not sure how the guy I sold the 6850 to would react if I asked him to bring it back

Tried all of that, none worked.

Thing that did work though was 10.8.4 installer, 10.8.3 and 10.8.2 didn't.

10.8.4 is up and running smoothly now, thank you guys.