Help req'd: Refresh rate problem Iiyama ProLite E431S / Radeon 7500on DVI

Hi,

I am unable to get this monitor to work at a resolution greater than
1024x768 using a DVI cable. Using the provided DSUB cable, all
resolutions work correctly. I have tried varying the refresh rate, but
to no avail.

While the XP boot screen is displayed the black background turns red,
and the screen is jumbled and blocky. Once in Windows at 1024x768, I am
able to change the resolution/frequency, but the following error is
displayed: 'Attention: Signal frequency out of range', and once again
the screen becomes jumbled.

Any ideas will be gratefully received.

Thanks,

S

Operating System: Microsoft Windows XP Professional
CPU Type: AMD Athlon XP, 1145 MHz (5.75 x 199)
Motherboard Name: ECS K7S5A (5 PCI, 1 AGP, 1 AMR, 2 SDR DIMM, 2 DDR
DIMM, Audio)
Motherboard Chipset:SiS 735
Video Adapter: RADEON 7500 SERIES (64 MB)
3D Accelerator: ATI Radeon 7500 (RV200)
Monitor:IIYAMA ProLite E431S [NoDB]