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falcora

macrumors 6502
Original poster
Oct 8, 2011
390
4
Hey all,

So I have a late 2008 unibody macbook pro 15". It has a 9400m integrated and a 9600m discrete card. I'm using the mini-displayport to VGA adapter to connect it to a monitor with 1920x1080 resolution. When I use the integrated card everything runs nicely. When I use the discrete, the image output just turns on and off every second. The monitor just alternates between 'lost signal' and showing me my desktop. It's really bizarre, and I would prefer to use my dedicated card because its better, but kinda need some help here.
 
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