Help!

My camera was taking photos without problem & the battery still had some charge remaining. I plugged it into the mains electricty supply the day after the last photo had been taken, to top up the battery ready for all day use(using the official Sony supplied adapter & battery) & the charging lamp illuminated as normal. After approx 1 hour I noticed that the charging lamp had gone out. Assuming this meant the battery was now charged, disconnected from the mains & tried to turn it on to view photos previously taken. At this point nothing happened & the camera wouldn't turn on. Also it wouldn't power on to take a photo. The camera won't power on with the charger connected either. There's no response at all.

Any ideas please?