I have a ASUS laptop that i have been using for years with no problem. For no absolute reason the headset that i use has a...

i was updating my imac, but i wanted to unplug something else which is in the way so i accidentally unplugged the imac mid...

You should just pull out the motherboard and see if you can find visible burn or burnt marks on the motherboard to see if its shorting when component is in use, Or you should just do a full run down on the trouble shooting guide on how to find the problem and fixing it.

Make good use of Ifixits guides to open up your laptop and clean the fans maybe use a vacuum cleaner, but do be careful about doing that