Power problems. I am having problems with power to my laptop. When I plug in the power plug, it

Question

I am having problems with power to my laptop. When I plug in the power plug, it shows that I am using the battery, when in fact I am using power. Sometimes it will show that i am using power but if I move at all the battery meter comes on again. Can you please tell me what the problem may be so i can get it fixed.Thank you so much