Flickering 2nd Screen

maddog1987

New Member
I have a toshiba tecra a4 laptop, which i have recently plugged into a samsung syncmaster 920nw monitor to use as a 2nd screen. The laptop graphics card is an ati mobility radeon x300. the resolution of the screen on the laptop is 1280x800. i'v tried the screen with other computers and works fine. however, when i use it with my laptop, with the resolution 1440x900, the screen works, but i get faint flickering horizontal lines on the screen.
it doesnt do it when i reduce the resolution, or when i use it as the only screen, just when used as 1 of 2 screens and at that resolution. Any ideas what could be causing this?

Thanks

Rob
 
the only available option is 60Hz. If i have the screen as the only screen it doesnt flicker, but if i then add my laptop screen as the 2nd screen it starts again, but the refresh rate hasnt changed?
 
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