OK. So this means the BIOS should recognise the AGP ADD card (ADD seems to be an Intel proprietary AGP extension) and enable the LCD data.
i know nothing about such ADD or AGP standard or protocol, but some experience from the past and some common sense may help on narrowing down problems a little bit. and thanks to this thread for giving so much more knowledge regarding this. i never encountered a MB that can spit video internally until i got my WM and i knew nothing about DVI, hence i made the least intrusive upgrade which is to buy the last MB revision that support internal dvo to AGP, same style as original, except capable to fit faster intel processor in, double the ram capacity and a little bit faster FSB, the original MB is topped out cant do anything to upgrade, even the ram is full slot but only 1GB. unlike some more knowledgable people here who went to the extend of drilling and diying their own DVI cable. i knew no such thing until recently when i have to diy DVI to HDMI adapter, then i know a little bit what every pins are, but thats all, i cant say i know something about it when looking on the board/components/functional/standard level. coincidentally i am working on a used PC with a broken graphics card, cleaning PCIe pins didnt help, adding capacitors as per internet advice didnt help, replacing with older card it works, so in the end the conclusion is, i have to buy new graphics card for the workstation. the net hinted possible rohs solder crack under the GPU, maybe i will bake it in an oven later, but i'm replacing it with a new card anyway since its older and only marginally better than my 10yrs old but faithful radeon card. and i found a cheaper alternative, ranked about half the performance, but currrent price is one tenth or lesser than the best gfx card on earth, so its a go (still in shipment, finger crossed i hope its compatible). congratulation on your simple fix.
Now let's add some memory.
be careful, you are going to spend money on it further, TEA syndrom may kick in. as someone adviced, you need to think carefully the worthiness of upgrading a system that needs a total upgrade in the first place. if you can get the ram like a dollar or 2, it maybe worth it for a little boost. i spent approx $100-200 upgrading my WM8K just to get it quite on par (faster actually) with my main PC in term of single core speed, but since its an even older tech, its a power hog, so now i have a water cool system inside a LeCroy WM8K
maybe i should have listened or follow the path of hardcorers here, but my limitation in knowledge prohibited that. cheers.