|more than likely, there's a problem either with the video hardware you just installed (did you buy it used?), or the software/drivers. Were they the newest available from nVIDIA's website? did you remove the old drivers prior to installing? Do you still have your old card, and does it still work? you might try switching back to see if the issue persists.|
there's also a chance it's your monitor. CRT or LCD? do you have another PC you could connect the monitor to, to see if the pink videos persist? if so, it's gotta be your monitor.