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Level 1

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Unable to install Mountain Lion on Mac Pro 4,1

I originally wanted to do a Clean Install on my Mac Pro 4,1 (Early 2009 - Single Quad).

1ST BRICK WALL: After running Install OS X Mountain Lion.app in Lion, it reboots to a Grey Screen/Prohibitory (Circle Cross Line) Screen. Resetting PRAM did not resolve issue.

Ok, how about a USB Thumb Dive Install...

2ND BRICK WALL: After booting off a Mountain Lion Install USB drive, none of my internal hard drives show up in the "Select Destination Drive" (i.e. no drives mounted).

I tried both methods with 2 different hard drives (1 Solid State Crucial M4 and 1 Stock Platter Drive)

Anyone else have similar problems? Any suggestions?

P.S. I have a "Apple Store" ATI Radeon HD 5870 installed.

Mac Pro, Mac OS X (10.7.4)

Posted on Aug 29, 2012 7:44 PM

20 replies

Sep 23, 2012 11:08 AM in response to Pete_B100

VernP

you defenetly saved me my time, after remove the wifi card everything start working, thank you so much

Sep 23, 2012 11:28 AM in response to hugoleitao

this is crazy, i've also figured out that i was using the exact same wifi model....

Sep 27, 2012 6:10 PM in response to VernP

Hey guys,

I just installed a brand new 512GB M4 into my MBP earlier and when I tried to boot into the USB Mountain Lion installer from my MBP by clicking on the orange installer icon, first the gray Apple logo showed up and later on a crossed circle kind of sign. And it would not budge from there.

Any ideas why?

Fortunately, I still had a Lion dmg file on some other USB and I managed to do Internet Recovery through it, so I am currently on Lion.

However, I want to do a CLEAN install of Mountain Lion.

Why wont my USB installer work?? Any help would be greatly appreciated.

The hatter

Level 9

60,990 points

Sep 28, 2012 8:55 AM in response to goldyn chyld

Crucial has firmware updates for the m4 - you need to apply that first for one thing.

Ought to move your post to ML forum; and might want to ask in the macbook forums.

Jan 27, 2013 7:25 AM in response to VernP

Had theses same issues, with the same model system. Wish I had found this thread about 3 weeks ago. I had forgotten I had installed the wifi card. Removed, all is well, almost.

Unable to install Mountain Lion on Mac Pro 4,1