Nokia 1600 Modem Problem

Hello..
i m having a problem with my Nokia 1600 modem
It was working properly..but in b/w when i encountered a problem , i hav reset and rebooted the modem..
now i m not able to connect to the internet..
The lights are flashing but im not able to connect..
I hav gone tru many forums , but i cudnt get a good answer which solved my problem...
So please help me in this....