I just switched motherboards from a Asus P3B-F to an as yet unidentified chaintech Socket A. The board has a Universal AGP slot and is running on PC133 ram. I know this AGP slot is ok because we just pulled it from my cousin's comp where it was running a NV 6200.

I setup the system, popped my V5500 in the slot connected the power lead and booted. OS (win 98se) installed fine everything seemed normal. Voodoo functions properly as a standard VGA. So I installed Amiga 2.9 & rebooted. When windows loaded all I could see was Blue vertical bars and a big white block where the mouse should be. I fiddled with all the bios settings (there aren't many) IRQ for OCI on/off Primary Display Onbaord AGP/PCI (only two settings) but still nothing. Reboot into safe mode and Everything is back to normal svga.

So what's going on? Is this an AGP issue? Any help would be most sincerely appreciated.

Nah, its either a VIA KT133 or a SiS 750 (Pretty sure it's the SiS) I looked up all the stuff on this board about a year ago when I built the system for my cousin but I don't remember now. Unfortunately it's one of those gems they didn't grace with a model no on the board. It can't be nforce though because its PC133, and as far as I am aware they never made a non-ddr chipset.

or a broken VSA-100, test your V5 in Single chip mode and see what happens, if the blue lines are gone, that means it has one defect VSA-100 chip.

Yep I checked it, still works fine with the Asus. Quake III runs like glass with zero defects.