Horizontal scan lines on iMac with mirror monitor

Hi, I just bought a second monitor which I'm mirroring, using a DVI cable. Everything looks and works great, but when watching video or iTunes visualisation, I occasionally see scan lines on the iMac display, but not the secondary. Also, dragging stuff around is jumpy and funny.
Here's the info from System Profiler:
*ATI Radeon HD 2600 Pro:*
Chipset Model: ATI,RadeonHD2600
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9583
Revision ID: 0x0000
ROM Revision: 113-B2250F-212
EFI Driver Version: 01.00.212
Displays:
iMac:
Resolution: 1920 x 1200
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Mirror: On
Mirror Status: Hardware Mirror
Online: Yes
Quartz Extreme: Not Supported
Built-In: Yes
2619:
Resolution: 1920 x 1200 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: On
Mirror Status: Master Mirror
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Television: Yes
Could it be something to do with Quartz Extreme suddenly (?) not being supported on the iMac display?
Cheers!
Message was edited by: Darren Jeacocke
Message was edited by: Darren Jeacocke

Ok update.... I followed directions here http://www.macfixit.com/article.php?story=20081110225534811 and Quartz Extreme is supported on both now, but i'm still getting the ugly scan line.
Profiler now reads
*Chipset Model: ATI,RadeonHD2600*
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9583
Revision ID: 0x0000
ROM Revision: 113-B2250F-212
EFI Driver Version: 01.00.212
Displays:
iMac:
Resolution: 1920 x 1200
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Mirror: On
Mirror Status: Hardware Mirror
Online: Yes
Quartz Extreme: Supported
Built-In: Yes
2619:
Resolution: 1920 x 1200 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: On
Mirror Status: Master Mirror
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Television: Yes
Something to do with Master Mirror/Hardware Mirror??

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