8 Replies Latest reply: Nov 26, 2007 8:15 AM by WolfmanT
WolfmanT Level 1 Level 1 (0 points)
I did an archive install of Leopard on my G5 8 core and when I startup with 2 monitors connected, the screens flash on and off every 2 to 3 seconds. When I disconnect one and start the machine it is fine and I can then attach the 2nd monitor with no problems.

If I start from the Tiger drive with both monitors attached I don't have a problem.

Can anyone tell me what this indicates? I am thinking Leopard has a problem supporting two monitors in the start-up.

Power Mac G5 8 core 3.0, Mac OS X (10.5)
  • 1. Re: Dual Monitor problems in Leopard
    doctorsid Level 1 Level 1 (0 points)
    I am using 3 monitors with leopard. Possibly it is the monitor car if a third party one. The driver issue could be happening. Or soem other third party program or enhancer is bugging it out. Hopefully you are not running any of that unsanity crap
  • 2. Re: Dual Monitor problems in Leopard
    Pamela Sudore Level 1 Level 1 (15 points)
    I have a MDD 1.45 G-4 with a nVidia gForce 4600 with a 20' newer cinema display on the DVI side and an older 20 inch Apple on the ADC side. Wen I upgraded to Leopard the newer monitor on the DVI side will all of the sudden start to get static and then go black. I turned off all energy settings and it still does it. I re-sat the card and also zapped P-ram. Nothing.
    Booted into Tiger and the problem goes away.
  • 3. Re: Dual Monitor problems in Leopard
    gary szunyogh1 Level 2 Level 2 (180 points)
    G5 Powermac

    Both screens go blue and flicker for a few seconds and then it returns to normal viewing but is getting worse. I can't use the mac at this time.

    I fear apple care is still swamped. Vid card is oem.
  • 4. Re: Dual Monitor problems in Leopard
    Pamela Sudore Level 1 Level 1 (15 points)
    (Or Anybody) Find out any info on this issue?
    I boot in Tiger, it's OK. I did lower resolution a little but it still seems to go in and out. I can't believe I am the only one having this issue.
  • 5. Re: Dual Monitor problems in Leopard
    paulmayson Level 1 Level 1 (0 points)
    I just started having this trouble too on a Mac Pro with 2 monitors. I will randomly get blue screens - then comes back to desktop. Only a few seconds but annoying. I've had leopard for just over a week (archive and install) and it just started yesterday. Sorry - no solution - just wanted to let you know you're not alone!
  • 6. Re: Dual Monitor problems in Leopard
    James Strickland1 Level 1 Level 1 (105 points)
    I just bought a brand new Mac Pro. The only third party app I have installed is the Retrospect client for backing up the system. I have one DVI monitor and one VGA monitor(with DVI adapter) attached to my mac. When the Mac was on 10.4 I had no problems. Both monitors worked fine. Now, since upgrading to Leopard, I can only have one monitor connected. If I connect both monitors, the Mac just stays at the blue screen. Has anyone found a solution yet? Is this an issue with using any dual monitors, or just using VGA monitors connected thru an adapter?
  • 7. Re: Dual Monitor problems in Leopard
    WRV Solutions Level 1 Level 1 (0 points)
    Yesterday I posted a similar issue:
    After Leopard install, no secondary display in PowerBook G4 1.67GHz
    Posted: Nov 20, 2007 7:55 PM

    I installed Leopard and had no issues during installation (Clean install). I noticed my 22" DVI monitor (HP w2207) no longer works. It shows very poor picture and has a message that the input is out of range. This monitor worked perfectly before (10.4.10). No need for drivers and displayed 1600 X 1050 60Hz.
    Anyone out there with similar issues with Secondary displays?
  • 8. Re: Dual Monitor problems in Leopard
    WolfmanT Level 1 Level 1 (0 points)
    The problem is with my monitors. I took it to the Apple Store and they hooked it up to their monitors with no problem. If I disconnect one of the monitors and wait till it starts up and then connect the second - it works fine.