Ryan, What OS are you using? If in OS X, it may be worth while to verify that the modem is still turned on (I am hoping that it somehow got turned off).
1. Go to System Preferences/Network
2. In "Show", from the pull down menu, select "Network Port Configurations" and then ensure the "Internal Modem" is enabled. If not, enable it, sing my praises, and restart. If that does not work, well, at least the verification process was easy.
Harv