I have bought the phone about two years ago and used it for about 8 months. Then, I got a new phone and put the nokia back in the box and on my shelf. Now, when I tried to turn it on - there is a constant black screen. I checked the charger and the battery and both of them are perfectly fine. The phone is on the charger for about 2h and still the screen is black when I try to turn it on... any advise?