Summary

Most of the time this is due to an Electrical Storm, bad drivers, misconfiguration in the modem, or telephone line problems (miswired or telephone company problem).

Body

Most of the time this is due to an Electrical Storm, bad drivers,  misconfiguration in the modem, or telephone line problems (miswired or telephone company problem).  Oftentimes you will have to get your modem replaced due to it being burned out

• Electrical Storms can cause a power surge in the telephone line just as easy as in an electrical line.  Since telephone devices cannot have as many variations in voltage, especially the modem, telephone line voltage surges can cause problems more commonly.  Check this site for more information:  http://www.808hi.com/56k/lightning.htm
• Bad Drivers can cause no dial tone.  Most of the time though, if this problem just started happening you may have just changed or upgraded the drivers.   
• Miswired telephone lines and/or telephone company problems.  Check to see if your telephone line is getting dial-tone to the computer.  Make sure your computer has the telephone line plugged from the wall to the modem jack that says either telco, line, or has a picture other then a phone.  If the telephone line does not get dial tone, then the problem is either in your household telephone lines, or the telephone company.

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