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10-27-2011 08:50 AM - edited 10-27-2011 08:51 AM
Your PC only has a 220 watt power supply. You should contact HP Partsurfer and ask about one the below video cards.
Look here at HP Partsurfer for video cards that are used in the newer Slimline models with a 220 watt power supply. These cards were manufactured specially for HP Slimline PCs with 220 watt power supplies.