Hi, My tablet arrived yesterday (with no manual) and worked fine straight out of the box. Spent the whole evening loading apps etc with no problems. It was very sluggish this morning and couldn't exit the screen I was on so I reached for the off button. It turned off instantly rather than asking whether I wanted to shut down. Since then nothing at all. The screen stays black no matter what, but occasionally I hear a little sound as if it's turning itself off. The battery was fully charged. I've kind of tried the reset button but to be honest I'm not sure what I'm supposed to do with it. Unlike other reset buttons I've come across it just seems to be a hole and I end up poking around inside the device. Any suggestions much appreciated!