my phone (bb 9900) was fully charged and i unplugged it and tried to unlock it but it wouldnt work so i took the battery out and put it back in but the light did not go on. Then i tried to charge it and the light still wouldnt go on, the battery works perfectly fine as i tried it in a different phone. So i then took the sim and battery and memory card out and left it over night and it still wont work, any help please?!
I am not sure what else there is for you to try.
1. You checked the battery in another phone so the battery is good.
2. You could try starting DM on your computer and plug the phone in through usb. If you get DM to see it and have an option to re load the OS you could do that.
3. Check the battery connection on your phone that they are making contact with the battery.
4. Try a different battery.
Let us know how it goes.