I have an HP ZR24w monitor connected via HDMI input to a newer custom machine running Win7, and via VGA input to an older Micron machine running Win98SE. I use the monitor's "source" setting to choose which system is displayed (a KVM switch controls keyboard/mouse input). This monitor has a 60Hz (or 59Hz, depending on where you look) refresh rate. When the Win98 machine is booting, the monitor reports "Signal Out of Range". I don't know if it's the resolution or the refresh rate that's at fault. Regardless, once Win98 starts, the video signal it produces is within range and everything's fine. So if I want to use Win98 I'm good to go.
But if I switch Win98 to DOS mode (via Restart in MS-DOS Mode), the signal remains out of range and nothing appears on the monitor. Ordinarily, I don't use DOS so this hasn't caused me a problem.
But now I'd like to change the older machine to dual boot WinXP and Win98. I know from prior experience that the boot menu through which I choose the OS at boot-up will be displayed during that "signal out of range" period. Obviously, I can't use a dual boot system if I can't see the boot menu. :-)
Is it possible to configure the old Micron machine to use a video mode during boot (and in DOS mode) that this monitor can display?