I tried all of the combinations of vsync, hsync, etc. Sometimes I would get no signal at all detected by the monitor, sometimes it would be out of range. I think that the video card is an NVIDIA GeForce 7600 GS. What is most perplexing to me is that I used this same desktop computer to install and test Knoppix 5.1.1 onto a bootable flash drive last summer, and the only thing that has changed since then is the replacement of the power supply. Everything else works fine. I can play games and video clips in Windows, but I can't run Knoppix from my flash drive. I have booted this image onto a different machine using the same monitor, and I have used the reported monitor settings on my primary machine to no avail.

When I originally set up my Knoppix persistent image, I had the resolution set to 1024x768, but it seems to make no difference what values I specify at boot time - I still can't get the monitor to work. Do you suppose that there might be something very minor wrong with my video card - something that might have been related to the failure of the power supply? Something that doesn't bother Windows, but that Knoppix can't tolerate? I have just about given up on this issue.

Thanks for your help and advice.

Deesy