2007 iMac, upgraded to Mavericks, second monitor now intermittently blinking

2.4 Ghz Core 2 Duo, 4 GB Ram. ATI Radeon HD 2600 Pro graphics.
Upgraded from Snow Leopard here at work, running dual monitors via DVI cable. Never a problem previously.
Upgraded to Mavericks. Enjoying it. Until the 2nd monitor (Acer v223w) started intermittently blinking.
Kinda befuddled. Can't find any answers. Any help?

Same issue here and its really killing me. 
When I disconnect the second monitor from the iMac and plug it back in, the blinking stops for a little while. But then it starts up again.
It seems to blink more when I'm using Chrome (latest version 30.x) with multiple browser windows accross both displays.
iMac 20-inch Early 2008
ATI Radeon HD 2600 Pro 256 MB
Mavericks 10.9
Second monitor HP w2207 connected with DVI cable and adapter.
Under Mission Control system preferences, I have Displays have separate Spaces unchecked, disabling the new Multiple Displays Mavericks feature.
Hope that hleps.

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