Update =This light is coming from the internal parts. Like if there is an activity with the system, the light will be blinking. This most probably should be from the motherboard. I assure you there should not be any issues with the system and you can continue to use the system. DELL-Cares
So I have a dell Inspiron 3593 laptop. I have taken good care of it to the best of my knowledge. Recently I noticed while plugging in my mouse, from the headphone jack I saw the green light blinking inside my laptop [not to be confused with the charging indicator light]. This the picture of it. Please note that it is blinking on my laptop.   [IMAGE]   [IMAGE]  
Inspiron 3593, green light near headphone jack blinking