Currently Being ModeratedNov 22, 2012 8:25 AM (in response to transco)
I just saw a thread about how non-Apple Mini Display Port to DVI adapters could cause this problem. I doubt that it applies, since it's worked perfectly for a year or more using 3rd party adapters (Accell), but I guess it is posasible. It sure would be the cheapest solution.
Currently Being ModeratedDec 18, 2012 8:30 AM (in response to transco)
transco, did you ever resolve this? I'm having the exact same problem. I've already gone through two sets of Accell adapters.
Currently Being ModeratedDec 18, 2012 2:48 PM (in response to Kelly Crossley)
Sorry, I should have posted this weeks ago... Yes, I fixed it by installing the Apple 'Mini DisplayPort to DVI Adapter'. I also was using the Accell adapters. I can't believe that Accell adapters suddenly went bad after many months of use, More likely, the Accell's started failing due to some change in the latest update of OSX. I have two similarly configured Mac Pro's (mid 2010 and early 2008) and both started failing with the Accell adapters and were fixed by installing the Apple adapters.
I recently had a similar experience with some 3rd party memory modules. Worked fine for years, then I couldn't even boot the computers. Replaced the 3rd party memory with the original Apple memory that shipped with the computer and it started working again. I hate to say it, considering the price difference between Apple hardware and 3rd party equivalents (4 to 1 in the case of the memory), but you're usually better off biting the bullet and buying Apple.