MacPro Monitors Go Black
Hi:
I've got six identical MacPros (late 2010 MacPro5,1) all 2x2.66 GHz 6-core Intels we use for retouching. All have Apple-installed ATI Radeon HD 5870s. All have the Eizo CG241W plugged into the DVI port on the graphics card and old 20-inch Cine monitors plugged in to one of the two empty mini-Display ports using an adapter.
Four are running Snow Leopard and are operating fine. We've started migrating up to Lion and I had 10.7.4 on two machines. Both were exhibiting the same problem — after working a while, both monitors would go black. The towers still are powered up, but the only way to get back to operation is holding down the power button to crash out and then restarting.
I upgraded one of the problem machines to Mountain Lion (10.8.2) figuring that maybe there was a Lion bug that got fixed, but the problem continues and seems to be coming more frequent.
I'm kind of stuck in a holding pattern. I don't want to risk upgrading any more of my machines, but I can't leave my main production boxes two or three versions behind the OS.
Anyone have any ideas? I've sent away to Apple for new Hardware Test discs (the latest I have is 3A183 and it seems to die doing the initial system check and never lets me hit the test button, so I'm assuming I've got the wrong disc for the wrong Mac).
Thanks.