IMac Dual Monitor, Mini-DP to DVI, Screen Blinking

2.4 Ghz Core 2 Duo, 4 GB Ram. ATI Radeon HD 2600 Pro graphics.
Been using Snow Leopard here at work, running dual monitors via Mini-DP to DVI cable. Never a problem previously.
Upgraded to Mavericks. Enjoying it. Until the 2nd monitor (Acer v223w) started intermittently blinking. Discovered I can trigger the blinking via the mail program on the second window - hiding and/or showing the info/mail activity left-side panel will cause the screen to blink.
Kinda befuddled. Any help?

I am having the excact same problem. With nearly if not an identicle system.
24" Mid 2007 iMac
Processor 2.8 GHz Intel Core 2 Duo
Memory 4 GB 667 MHz DDR2 SDRAM
Graphics ATI Radeon HD 2600 Pro 256 MB
Software OS X 10.9.2 (13C64)
Serial Number W87***B2ZCT
Display 1: Built-in iMac Display (1920 x 1200)
Display 2: ACER 23" Wide Screen AL2223W Display (1680 x 1050)
Since I updated to the latest version of mavericks the other night I have had frequent flickering and blacking out of my screen. It happens mostly when I mouse on or mouse off my dock menu, and open programs on the second monitor. There is also little yellow and organge flickers throughout the screen from time to time almost like an interference patter, generally 1px high and 20px wide with varying degress of static.
I have tried the following with no success:
- Reset my PRAM / NVRAM
- Reset my SMC
- Deleted com.apple display related files
- Used screenResX to try and find a different Display 2 options
- Lowered resolution of Display 2
This is extremely frustrating because I am a web designer and programmer, and having my 2nd monitor not functioning basically renders my work station useless for me.

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When asking for help, post your question in the forum. Remember to include your system type, model number and OS. Do not post your serial number.
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IMac Dual Monitor, Mini-DP to DVI, Screen Blinking

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