..but I can't figure out what it is!
I had everything running using a VGA computer monitor and an Nvidia TI 4600. I changed the resolution to 800x600, color depth 32.
Then I swapped out the Nvidia for the ArcadeVGA card. Following Andy's instructions, I connected a flat panel LCD monitor to the DVI port and my new Betson to the VGA port to make sure I'd get at least one signal I can use.
On boot, I get a quick flash of the dos screen on the Betson and the Dell startup screen on the LCD panel, but when it starts to boot into windows, both monitors give me a "no signal detected, check cable" message. Whatever is going on, I'm not even certain the arcadeVGA lets the computer finish its booting, as I have VNC on the box, but can't get to it over the network either.
Swapping out the ArcadeVGA for the Nvidia restores it to working again.
Any ideas?