When you say the video card on the motherboard I guess you are referring to the video graphics port at the rear of the motherboard? In some cases you don't need to disable the video port that is attatched to your motherboard. You can just purchase a new video card and when you insert it, plug your monitor cable into this port and when you start your computer it should be recognised. Just make sure that you match the video card connector to the type of video card slot you have on the motherboard. You will either have an AGP (Accelerated Graphics Port) slot or a PCI (Peripheral Component Interconnect) Express x16 slot but not both. Before purchasing the video card make sure you look very carefully at the minimum system requirements, it generally should be ok though. If you just want to improve the graphics then a standard card should be adequate. What type of monitor do you have, flat screen or old box (cathode ray tube)? If you have a flat screen then chances are it can accept a high spec card. Monitor and card have to be compatible.
If you need to disable your onboard video port though then you would do this by accessing what's known as Cmos Setup. When you boot up your computer it will tell you which key to press to access setup, it's normally F2 or the delete key. Once you press this you gain access to the settings and you can search for the ability to disable the onboard video port. I'm pretty sure that you don't need to do this though, when you insert your card it should be recognised. I hope this is somewhat helpful to you. All the best. Andrew
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