I have a Gateway 2000 with the same board. Intel bios disabled video. Where did you find a Gateway Bios? In my case it originally came with the Gateway BIOS, but I also found the latest version online years ago: 7502875.exe If you currently have the Intel BIOS, you probably need to use the recovery …

I have an LT430TX, more precisely an OEM version of the board that came from a Gateway 2000. It has onboard ATI Rage video but no sound. Interestingly, the onboard video works only when using the Gateway BIOS. If I flash the generic Intel BIOS, I can only use the board with an add-on PCI video card …