IBM ThinkCentre 8199 has black screen cant get to anything to install or uninstall?

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gopher4753

TS Rookie
While I was gone a friend? tried to upgrade my video card from the original intel to a Nvidia Tnt2 so they could play games faster I guess. Now the monitor is black and there is no available graphics to enter the bios, the safemode or anything else. I know a little, very little bit about computers but if someone could tell me how I can follow instructions to get my computer back up and running. Thank you for any input
 
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