MacBook Pro overheating when I close the screen

I have a Macbook Pro one year from now.
I used it without problems until a couple of weeks that when I closed the screen (not shut down) and I plugged to electricity, the mbp becomes extremely hot.
Any suggestions how to solve the issue?
Thanks.

OK. Open Activity Monitor and select "All Processes" at the top and "CPU" on the bottom bar. Then look through the CPU column and see if you can find some process--perhaps a hung up printer process--using more than 50%--maybe even 100%--of the CPU. These hung up processes, if you have one, can generate a lot of heat.
Also, run the extended version of the Apple Hardware test, just to be sure that the fans and the thermal sensors are functioning properly. If you get any error codes, please post back with them.
Good luck!

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MacBook Pro overheating when I close the screen

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