AGP and PCI cards are similar size, but the connectors are not identical. Not only will an AGP card not communicate with a PCI slot, but they are "keyed" differently, meaning they have cut-outs in different places. Don't try to force an AGP video card into a PCI slot because you can damage the card.
Instructions
1. Obtain an AGP-to-PCI adapter. These can be difficult to find, but they do exist. You may have better luck locating one online than in a computer store. Be sure you get an adapter for PCI, not PCI Express (PCI-X), or it won't fit in your available PCI slot.
2. Insert the AGP-to-PCI adapter in your available PCI slot with the computer turned off. Press firmly to be sure the adapter is seated correctly in the slot.
3. Turn your computer on. Install the AGP-to-PCI adapter per the instructions that came with it. This may require inserting a software disk and following on-screen prompts. Once the installation is complete, shut the computer off again.
4. Insert your AGP video card into the adapter. Press firmly to be sure the adapter is seated correctly in the slot. Depending on the clearance inside your computer, you may need a short AGP video card for both the video card and the adapter to fit inside the computer.
5. Turn your computer on. Install the AGP video card according to the instructions that came with it. This will probably require inserting a software disk and following on-screen prompts. At the end of the installation, restart your computer.
Tags: video card, your computer, AGP-to-PCI adapter, sure adapter, adapter seated, adapter seated correctly