Internal Battery

Hi, Today I was using my ASUS K555Q When it suddenly turned off. I've been trying to find a solution online but had no luck so far. Recently I found a post that said something about a little hole on the back of the laptop. I tried to find this hole but I wasn't able to. Please help and thanks...

Hi, I have bought a new asus x553s, it worked fine till today. Now, I can't turn it on. I have tried to hold the power button for 30+ seconds over and over, but it did not help. I can't take out the battery cos it is internal. Can someone please help me solve this? Thanks in advance, Lina.