ATI Radeon HD 6870 - White screen with a mouse pointer

[Sword7]

Hello folks,

I bought OS X ML 10.8 from app store and downloaded it. I ran UniBeast 1.5 to set up my thumb drive. It only took 10-15 minutes to complete. Yes, I am using new 8 GB USB 3.0 Patriot XT supersonic thumb drive.

I restarted system and tried boot it. I always ended up white screen with a mouse pointer through many different boot settings. I learned a few users have same problems due to ATI 6870 graphics card. One of users removed a 6870 and it went through.

With Lion 10.7.x, I have same problems with video stream. It always freeze after just started.

Does anyone have any solution with ATI Radeon 6870 graphics card? My system configs are:

ASUS Maximus IV Extreme
i7-2600K processor
8 GB memory modules
MSI R6870 Hawk

Thanks!

 

[MattMcHackit83]

Use the CPU's Onboard graphics for the installation, then switch back to the graphics card after you're done. 68xx graphics cards work fine in ML itself, but the installer doesn't seem to like them!

Hello folks,

I bought OS X ML 10.8 from app store and downloaded it. I ran UniBeast 1.5 to set up my thumb drive. It only took 10-15 minutes to complete. Yes, I am using new 8 GB USB 3.0 Patriot XT supersonic thumb drive.

I restarted system and tried boot it. I always ended up white screen with a mouse pointer through many different boot settings. I learned a few users have same problems due to ATI 6870 graphics card. One of users removed a 6870 and it went through.

With Lion 10.7.x, I have same problems with video stream. It always freeze after just started.

Does anyone have any solution with ATI Radeon 6870 graphics card? My system configs are:

ASUS Maximus IV Extreme
i7-2600K processor
8 GB memory modules
MSI R6870 Hawk

Thanks!

 

[Sword7]

Ok, I got it but my motherboard uses P67 chipset that does not support onboard graphics. It still requires graphics card plugged in. Only solution is replacing it with a new P77 motherboard. Or get different graphics card.

Which graphics card do installer supports?

Thanks.

 

[Fab13]

I had the same problem for two weeks. Check out this post that worked perfect for me...

http://www.tonymacx86.com/mountain-...mountain-lion-6xxx-gpu-issues-fix-inside.html

I hope this helps

GA-Z77X-UD5H - i7-3770K - HD 6870 2GB - Vertex 4 SSD x2 - 16GB Kingston XMP 1600 Memory
Geek Bench 16925

 

[imate]

The final solution!

In 10.8.2 everything works perfectly, except installation. If you have integrated GPU, then use it while you install the ML. In bios, just set IGPU to primary and set memory to 64MB (don't forget to plug your monitor to the right dock).

Now you can install OSX smoothly. Do those steps you should do to make your Mt. Lion ready.

After you've done everything (at least the second normal boot of your system), go to BIOS and set your GPU to auto again.

If you haven't done it before, add GraphicsEnabler=Yes flag to your boot file. Now you should see your Graphics correctly in system profiler. It should use Duckweed by itself! No need to pciroot or any other graphic patch in boot file!

If you don't have integrated GPU, try maybe use a working ati6000.kext from someones system. Maybe it helps.