|This is probably your specific model number that's on the sticker on the outside of your case.|
HP Pavilion Media Center TV m8000n Desktop (home support page) PChttp://h10025.www1.hp.com/ewfrf/wc/product?product=3377257&lc=en&cc=us&dlc=en&lang=en&cc=us
HP Pavilion Media Center TV m8000n Desktop PC Product Specifications
•Form factor: microATX - 24.4 cm (9.6 inches) x 24.4 cm (9.6 inches)
•Chipset: NVIDIA GeForce 6150SE nForce 430
•Memory sockets: 4 x DDR2
•Front side bus speeds: 2000MT/s (2.0 GT/s)
•Processor socket: AM2
◦2 PCI slot
◦1 PCI Express x16 slot for graphics card
◦1 PCI Express x1 slot
•For more details, see Narra motherboard specifications .
Integrated graphics using nVidia GeForce*Integrated video is not available if a graphics card is installed.
•Integrated graphics using nVidia GeForce
•Up to 256MB (with 512MB or more system memory)
•Also supports PCI Express x16 graphics cards*
Your mboard has an empty PCI-E X16 slot.
Your video will probably be fine if you plug your monitor into a port on a PCI-E X16 video card installed in that slot instead of your onboard video's port.
However, Gretti may have more info about whether or not that's likely to work. I'm more familiar with AMD main chipsets and ATI video.
Your power supply probably has only a 300 watt capacity (max output wattage capacity rating).
You MAY may also need to install a power supply with more capacity, depending on which video chipset is on the video card you install.
Your power supply must have at least the minimum 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 ! )
If that info is not in the ad for the video 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. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.