|In most cases when you install a video card in a PCI-E slot, the onboard video is automatically disabled - in that case a monitor will display nothing when connected to the port for the onboard video, and there will be no entry for the onboard video in Device Manager under Display adapters. |
XP does not have the drivers for your video card built into it. It might install some sort of standard VGA adapter drivers for it
You should uninstall the drivers and other software for the onboard video before you install the drivers and software for the card. If there are entries for the onboard video in Control Panel - Add/Remove Programs, un-install them. If they're are not, look in DeviceManager - Display adapters - if anything other than some default VGA adapter is listed, RIGHT click on the entry, and Remove it, but in that case DO NOT reboot the computer before installing the proper software for the card. The video has to either be set to default VGA adapter, or in a "safe vga" mode which is what removing the entry does, when you install the drivers and software for the card. DO NOT install anything for the video card while booting the computer, other than a default VGA adapter, BEFORE the drivers and software have been installed with the proper installation program, otherwise the software probably won't work properly.
NOTE that some video software requires you have a certain Microsoft .Net Framework version installed before you install the video software. You can find out whether that has already been installed by looking at the programs listed in Control Panel - Add/Remove Programs.
Go into your mboard's bios Setup and make sure Intialize Video First or Primary Display Adapter or similar is set to PCI-E after the card has been installed physically. If that is set to PCI, the video still works in Windows but Windows can't use the superior PCI-E capabilities the specific video drivers you have loaded for the card support .
NOTE that emachines desktop computers are well known to often have el-cheapo power supplies in them that tend to malfunction and eventually fail a lot more often than average, and when they fail completely they are more likely to fry something elsewhile failing - often the mboard - this is especially the case for BESTEC brand power supplies!!!
Check your PS.
See response 4 in this:
If it is failing, or in any case, you can usually replace it with any decent standard sized standard ATX PS with the same capacity or greater.
Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.
Don't buy an el-cheapo PS.
See response 3 in this:
You MAY need to get a power supply with more capacity.
Your power supply must have at least the minumum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD!)
You can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements.
If you want to cover any possible video card, a minimum 600 ot 650 watt power supply will handle any current high end video card, or even a X2 card (two video chipsets on one card) or two cards in two slots.