My laptop heated up after I turned it sour,AC power supply be bad,this is smthing strange to me, any view?

Yesterday dark I turned off my laptop as usual , disconnected the AC power cable and kept it contained by the bag.I took the shoulder bag and went to TV room surrounded by the hostel and was sitting keeping the sack on my lap.
After sometime I found that the pod is breathing hot air, yes i could get the impression it from out side .I rushed to my room and took off the cover, I found that Laptop is heated up significantly, must be above 45 degree .I turned it on , ensured that everything is first normally and other functions are fine.But the mobile was discharged to 40%, which be full before I packed out it.Then I used it for sometime .Now there is no problem next to as yet. But
I'm worried beside this fact because have it been gone unnoticed , anything could enjoy happended.Secondly laptop is just an year hoary, I dont wont to happen this again next to it.I heard of heat up during usage but this is very unusual and strange.Anybody have experienced this kind of problem?

Answer:
If you have the lid closed and the computer off, you hold some wires crossed, unless you have the money to win it checked, just give somebody a lift out the battery when your not using it.
Also, most warranty only cover one year, if its have been beneath a year, call the factory owner right now and relay them about your problem, they will fix what ever it is thats messed up..

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