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No Monitor Showing In Device Manager


I have a hannspree 28" monitor with an hdmi connection to an asus radeon 4890 graphics card. This set-up works fine in vista ultimate 32 bit in the screens default resolution of 1920 x 1200.
Ever since i installed windows 7 64 bit, in a dual boot scenario, i have been unable to get win 7 working correctlyin normal mode, it works in safe mode but only at 1600 x 1200.

If i attempt a start in normal then the boot sequence stalls however i can open win 7 in normal if i remove the radeon 4890 from the display adapter element in the device manager. Win 7 installs the re-installs the 4890 but i can not get the correct resolution. With the latest ati drivers installed in the card there is no monitor showing in the device manager at all.


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