Why does my Macbook Pro screen go black when the charger is plugged in while using bootcamp?

While on bootcamp, my computer runs perfectly fine unless I have the charger plugged in. Once I plug it in the screen goes black and starts to charge. I know the computer is still on because I can hear audio from videos if one is playing while I plug in the charger. Once I unplug it the screen comes back on. This makes it so I am unable to work on my computer with the charger plugged in. This is a new problem and did not start once I installed windows 7, it used to work fine. Any suggestions?

Thank you for your suggestion! It helped me with this issue as well. My problem was that I was that Windows had started but wasn't logged in yet--the brightness keys didn't work on the windows login screen. I had to log in to Windows, then plug in the power, then turn the brightness up.
Thanks again for the suggestion!

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