Problem solved! I changed the monitor driver and was able to force the refresh rate to 60Hz. I guess these old cards don't play well with the PnP monitor driver. Thx for the reply.

So I'm trying to use a Diamond Stealth 64 2MB DRAM VLB card with an LCD monitor in 1024x768x16bit in Win98SE, but after trying several different drivers I can't get anything but a scrambled screen and an "out of range" message from the monitor. I suspect it's trying to use 43Hz interlaced mode and …