I'd have to replace the motherboard. I looked at the manual and there is no jumper.
About 55 bucks? http://www.compgeeks.com/details.asp?invtid=M6VLR-N
If you forgo the onboard video, maybe less?
A friend of mine have a desktop with a mb 754LMR, which has, among others, agp video integrated. The video port is having problems, and I recommended to install a brand new PCI video card, but I cannot disable the integrated video in the BIOS. I deleted the video drivers in w98, and install the new card, but the boot procedure does not show anything on the monitor. Can somebody tell me how to do that and how to use the pci video card as my video default?