[ubuntu] New Precise install wont recognise nvidia video card, old install did

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http://ubuntuforums.org – Just got a new (well secondhand) pc and installed 12.04 on it, moved my video card over as well, but despite installing (and uninstalling, then re-installing) my video card, the system does not recognise it, it just says "unknown" and "standard" instead of "Nvidia EN8400GS" and "enhanced" as it did in my previous install. I ve enabled the hardware drivers in the GUI and in the terminal but it doesnt make any difference, pretty sure Unity is 2D as well. What can I do to sort it ? (Hardware)