Mac Pro 5,1 Screen Flickering OS X freezes

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Mac Pro 5,1 Screen Flickering OS X freezes

One of the machines in my department started to act werid...

It's a Mac Pro 5,1 that suddenly starts flickering right at startup and continues to flicker all the way till you hit the desktop. None of the Adobe suite software works, Finder freezes and I must reboot.

Specs are according to this link w/16GB of RAM:

http://www.everymac.com/systems/apple/mac_pro/specs/mac-pro-twelve-core-2.66-mid -2010-westmere-specs.html

Display is a LED Cinema Display 30"

Video Card is ATI Radeon HD 5770

Anyone else goin thru this?

Help!

Mac Pro

Posted on Aug 30, 2012 11:59 AM

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Answer 1

Aug 30, 2012 6:44 PM in response to ArtDeptC2

Use safe mode, and it will do one round of "Repair Disk" then come up with minimal extensions loaded. At that point, it's all Apple software. If it flickers then, it has a Hardware problem.

To invoke Safe Mode, hold down the Shift key as you restart. It takes several minutes. The login screen will say "Safe Mode" in RED, and you will need your User_id and password to proceed, even if you normally auto-login.

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