It light up, it even says that it's plugged in but the percent keeps going down. When the battery was critically low and it didn't turn on, I plugged it in and it was charging so I was glad but it only reached 90% and it went down again as if the charging process stopped. I tried to use up all the battery's juice hoping that it will charge up again but this time it's not working at all. I'm so worried.Is is probably a little light by where the charging cable plugs in that lights up in the unit is charging. Is this lit up when it is plugged in? If the light is not on, the first thing you can try is another charger. Perhaps you can borrow one that works with your machine. Don't plug in just anything. The plug needs to be the same size and the voltage output (charger should say) needs to be the same.