Cellphone Siemens C66 . Please need help

[Vicky2007]

Hello everybody!
My brother has a cellphone, a siemens C66 which wont power up. Suddenly stopped powering up. It wont do it with different batteries or cables. It wasn't dropped or anything like that. He's desperate because he really needs its database and he never copied this database to the memory chip that comes inside the phone. He didn't know he needed to do it.
I don't know much of electronics, but I wish somebody here can tell me what this could have happened and how to make it power up agai, at leas to transfer the data to the chip or to browse for the information.

Thank you very much.

Vicky