Gary D MacDonald , The hinge mechanism may be damaged as there has been a few reported in forums 1st link below, which would require a major tear down to address.
Note the two red arrows. These point to the inner mounting points of the tension springs. The one on the left has broken lose, the one on the right is good. The inner ends of the springs are held in place by plastic washers and one failed. If still under warranty, use your warranty for repair/replacement. If not under warranty check out the other links to see how to fix the hinge on your Mac. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
https://discussions.apple.com/thread/5717518?tstart=0
https://www.youtube.com/watch?v=81PjGv8B-eo
https://www.youtube.com/watch?v=5ctAzpcjo4o
https://www.youtube.com/watch?v=sR8LM50L0Z4
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