YOu don't tell us the brand/model of the system you are currently using or the motherboard if it is a non branded system. That is really important to know to help.
Greetings all, I'm new to the forum and I hope someone will be able to offer some advice.
Sick of onboard "AGP" graphics which wouldn't play DVDs faster than 10 fps I decided to buy a cheap PCI graphics card; a 32Mb Pine 3D phantom (based on the SiS 315E chipset).
I installed it into a motherboard from an unknown manufacturer with the VIA Apollo MVP4 chipset.
The card refuses to give any output whatsoever despite me changing the "primary VGA" in bios to "PCI card" from "AGP". Also I disabled the onboard AGP but there was still no response from the PCI card. Interestingly enough, with "onboard AGP" set to "disabled" the onboard graphics still produces an image.
In addition, when I allow the machine to boot up Win98SE it doesn't detect the card. I've swapped ethernet and modem cards around enough to determine that all the PCI slots work. Also, when I put the PCI graphics card into my shuttle, it boots first time and uses the PCI card as the primary VGA device.
What could possibly be wrong?
Cheers.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic