Monitor flickers when screen saver runs

I have a two monitor setup. I just put in a replacement video card which has one ADC port and one DVI port. The monitor on the ADC port flickers when the screen saver runs. But it doesn't seem to flicker at any other time. The monitor on the DVI port has no problems.
I wonder if there's anything I can do to get rid of the flicker. Could it be the card, which otherwise seems to work fine? Or could it be a memory problems?
Any thoughts appreciated!

I wonder if it is the screen saver. Some really put the 3D graphics hardware to task. Have you tried switching to a screensaver that doesn't demand serious hardware acceleration like "Computer Name" or one of the "canned" savers that display picts like Cosmos, Beach, Paper Shadows, etc?
I keep two different types of temp monitoring on my Macs so see what programs task the system, One is software and the other is a direct-read remote thermometer (remote sensor tucked in the exhaust port of my Intel iMac). When I run the 3D savers, I can see the temps start to go up.

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How do u remove airplay set up box when screen saver is on when watching apple tv ?

I just found an answer to my question yea
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Applications quit when screen saver is running

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I have begun to experience the same problem on an iMac G5 running 10.4.5. About 50% of the time all applications will have quit upon returning from sleep mode. This computer was recently purchased and the files from a PowerMac Quicksilver G4 were transferred to it. This problem has not appeared on the Quicksilver.
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If it's one of Apple's preinstalled or a 3rd party screensaver, check to see if there is a plist file inside the ~/Library/Preferences folder and trash it. Restart your computer.
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Why does my Mac Pro now crash when screen saver starts?

I've upgraded my Mac Pro Mid 2010 (5,1) from 10.8.5 to 10.9.3 and I have a problem. When I use one of the screen savers without a photo, the screen saver works fine. But when I try to point it to one of my existing photos on the machine, it hangs when the screen saver kicks in and I have to force quit to get it running again.
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Hello,
may be it´s a problem with BOINC, if the problem won´t occur with windows screen saver.
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Hi,
Check the cable connections and make sure that they are tight.
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Monitor flickers when screen saver runs

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