I have a ASUS ROG 750 17'' laptop and mine was playing just fine for about 2 months since its purchase. Today i thought of seeing my battery level and it was saying 96% but not charging. I got furious and started googling all of this, but nothing helped. This is what i did. C-PROGRAM FILES-ASUS-PG4-CLICK ALL ASUS EXECUTABLE FILES AND FINALLY CLICK POWER GEAR . Change it to High Performance and viola, it charges again.
I do recommend taking out the battery and then cleaning it first. Then trying this method.
IT HAS A MIND OF ITS OWN, and it will work again on its own if this doesnt work. But please try this first.
But at the end, love god and pray. Mine's working perfectly fine and i absolutely love this machine.
**I USED TO KEEP MY LAPTOP PLUGGED IN 24/7, DONT DO IT. IT IS THE CAUSE OF THE PROBLEM**
Good Luck.