Get into a terminal program and type the following command AT&F1&W .
 This should reset the modem to factory default.  Good luck. 

Ezzerhauden  wrote in article
...
> My modem recently quit working except at 2400 bps. I have tried changing
port 
> settings and modem speeds but nothing works. Any ideas? It isn't the
modem, 
> because I exchanged it for a new one just like it.
>