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Dual Monitor Problem Horizontal Lines

  • Graphics Cards
  • GPUs
  • Monitors
  • Acer
  • Graphics
Last response: in Displays
December 23, 2009 9:16:07 PM

Dear All,

I just bought a new 23 inch Acer monitor. My old monitor is a 17 inch.

My GPU has 2 DVI ports.
I connected the new Acer by DVI and kept the old one connected to the GPU via VGA by using an adaptor.

The problem is that when both are connected, the Acer gets these weird horizontal lines and whatever is below it becomes distorted. This line rises when doing anything involving the graphics accelerator, and anyhting below it flickers and becomes corrupted.

It is clearly a GPU problem, as nothing is wrong with the new monitor, as when i disconnect the old monitor the problem goes away.

However, i wish to have a dual-monitor setup, so i need to resolve this issue.

Please advise... my GPU is an ATI HD 4670, 1 GB...

More about : dual monitor problem horizontal lines

a b U Graphics card
December 24, 2009 12:29:47 AM

Have you tried reducing the monitor refresh rate?
December 24, 2009 1:34:57 AM

for which monitor?
Related resources
December 24, 2009 11:32:51 AM


Its cause my 4670 was Overclocked, set it back to default, its fine now. =D
a c 332 U Graphics card
a b C Monitor
September 24, 2012 4:47:40 PM

This topic has been closed by Mousemonkey