Problem with internet ADSL

Hi to all, I have a modem Trust MD 4050 and Adsl with 4 M. All work fine for

long time, once day the internet stopped. I turn on modem and PC and the

connection didn't work. Now I can connect only with diagnostic option. I saw

when happen this problem the web page the modem it was impossible open so I

did reset the modem-router to see the page. I putted the username and pass.

But the only way to go in internet is click one or two time diagnostic more

I formatted hard disk and replace windows

How can I in auto connect how before ?

Thanks Fabrizio