I have a Dell Inspiron 15 3542. It was working perfectly then all of a sudden the screen went black and the computer shut down. I plugged the charger in which the light on the adapter stayed green but the computer light didn't show it was charging. I also tried removing the battery, holding the power button for 20 sec, then plugging in the charger to turn on but it still didn't work. I ordered a replacement battery and charger and it still will not come on. Could it be the charging port needs replacing or could it be the motherboard?