So, My Jumper Cable Just Got Stuck In The GND Pin Of Arduino's Main Board. I Tried To Take It Off Using Magnet But It Is Confined To There. Should I Buy New Arduino Main Board?
Fascinating question. 
I don't think we can quite figure out what you mean. How would you imagine a magnet would help?
Perhaps try to explain it better, but a picture would really help. Taken in outside daylight of course.
Most Arduinos have several GND pins - just use another one.
Hi
If your arduino is a UNO/Mega/Due, and the pin was inside a row of "female" pins, you can remove it.
Carefully use a thin blade, like a knife, (be careful not to hurt yourself),
fit it between the black plastic of the bar and the arduino and make a slight pressure on one side, then repeat the procedure on the other side and alternate.
Gradually the pastico bar leaves the arduino.
After separating about 2 or 3 millimeters from the arduino, try pulling the bar to separate it from the arduino.
Then remove the pin and carefully insert the bar into the arduino.
If my description was not clear, feel free to clarify any doubts.
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but it didnt work
What exactly didn't work ?
Is the GND pin that you tried connected to the one with the pin stuck in it or is there more damage ?
pin stuck
but it wont work
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