I know my system is loading but the motherboard showing activity
Does this mean your mobo IS showing activity? If so, what activity? Or does it mean your mobo is showing NO ACTIVITY?
I removed the video card and that was all
You also removed at least the fan. And the cooler. Did you remove the mobo from the case?
Does the cpu fan spin and remain spinning when you start up?
If you removed the mobo from the case, you need to check for shorts and cables not properly connected, same as if this was a new build failure to boot. In any case, re-seating the cpu, heat sink, and graphics card are in order. I'd also pull and re-seat memory as this sometimes gets jostled when pulling a heat sink.
twoboxer is right but be careful thought I like to add that - usually its the memory and the video card. When the RAM (memory) is not inserted right, sometimes it won't give a beeping warning at all. Then the video, also make sure the monitor signal cable is inserted to the nvidia card not on the built in video. Work on a well lighted area.
Just because you hear the drives spin up and power comes on, doesn't mean you are even starting POST. If you were, you would see it.
Did you make sure everything is plugged in correctly, that you didn't unplug something while you were messing around in case?
Did you bend any of the pins in the socket when you were messing with the CPU?
Did you plug the heat sink fan back onto the correct pins?