I have two modems installed, a U S Robotics and an HCF.

This morning the one I always use {US Robotics} worked fine but this afternoon, I continually get the message when trying to dial up that there is no dial tone. I have hooked a phone to the line and there is a dial tone. I ran diagnostics which shows that everything is fine. When I changed default modems to the HCF, It dials up fine.

I reinstalled the modem with no luck. do I need to purchase a replacement?

Thanks!

Jeff