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mac pro 5.1, 30 inch cinema, radeon 5770, get occasional flicker, then total snow on the display. after reboot or sleep, recovers. Long periods where it works fine. What gives? Using dvi connector. Just got the new 5.1, worked fine on a mac pro 1.1. Have a second screen using display adapter to dvi, works fine while cinema can flicker. os x 10.6.7. Flickering now as I type this.
ok, I figured this out. 1. CD using dual link DVI connector to card, 2. second monitor, a 21 inch nec from display port to DVI. With second monitor plugged in to display port physically next to DVI connector on the 5770 card, CD will flicker, lose synch, all sorts of stuff. Fix: Move 2nd monitor to the other display port. All now is good. Thoughts?
well, an update. The solution actually was related to the usb connector from the CD to a USB hub. Fiddled, changed ports, now that was the actual fix.
Wow... interesting. I started having problems with my 30" Cinema display. It was a snow, or field shift effect. All over the screen, some pixels seemed to be displaced to the side. Same problem with different screen resolutions. Your post made me think. Rebooting, powering the screen on/off, unplugging the screen: all no improvement. In brief, unplugging my USB and Firewire from the incoming cable to the monitor fixed it. I can't prove causality, but now my screen works, and my keyboard is instead plugged into the USB directly, not via the monitor.
in the end, mine was finally fixed by getting the screen serviced by Apple. The logic board and brick were both replaced. Interestingly the display did not fail on some macintoshes and a pc operating at full resolution. It seemed to not like the more advanced video cards, like the 5770- which we had swapped as well, didn't matter. Since repair, it has been fine. None of that other stuff ended up mattering. It actually was a difficult diagnostic problem given the fact that on some machines it worked fine and on others it did not.
Thanks. Ultimately, I fear that might be the fate of my mobitor also, though I am expecting repair will be expensive. Though the monitor is actualy clearer than it's been for a while (I used to have some very faiint ghosting or snow fringes around some high contrast areas).
I appreciate the warning, though.
Mine turns on and off completely at times, at random. Drives me nuts. Resetting pram/SMC fixes it for months at a time.
tried that, too. It was a zebra.. didn't fix it for months, made me think it helped for a few hours.. Ever since repair, display is rock solid.
30 inch cinema display, flicker, mac pro 5.1
