This laptop had a sound issue even before a phone charger was mistakenly plugged in to the earphones port (not by me). It used to be the sound would degrade into an unintelligible garble at random times. I would restart the laptop a couple of times and it would go back to normal. I would personally hazard a guess that some component is overheating, possibly some component has burnt out.
Now, post phone charger incident, when the pc is off and cold, you get about 5 min. of sound when you power it up, then nothing. It seriously overheats on the bottom right corner, just where the earphone plug is.
Placing a PC fan under the overheated part brings down the temp of the affected zone considerably, the sound even comes on for 2 seconds at a time every now and then.
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