Test/Troubleshoot a New Modem


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Tutorial Home >Hardware >Components >Modems >Installing a Modem >Test/Troubleshoot a New Modem

  Introduction

Computer communication via modem is notoriously finicky. Many things can go wrong—there can be COM port conflicts, problems with the phone line, and many other kinds of problems. Here's how to test out and troubleshoot your new modem.
  Step 1:  Use Windows Diagnostics

Windows has diagnostic software for detecting modem problems. Click the Start button, and then choose Settings from the Control Panel. Double-click the Modem icon. Now click the Diagnostics tab, and then click your modem. Now click the button that says More Info. If there is a problem with your modem setup, you get an error or a "port already open" message.
  Step 2:  Try Connecting to the Internet

Dial in as normal. If you've never connected before, use HyperTerminal, built into Windows to test your modem. In Windows 98, click the Start button, and then choose Programs, Accessories, Communications, and then HyperTerminal. You'll see several icons, including one for MCI Mail. Double-click the icon to dial in. If your PC dials your modem, and you make a connection, it's working properly. If not, check out the following troubleshooting tips.
  Step 3:  Check for a COM Port Conflict

To check if there is a conflict, first right-click My Computer and choose Properties. Next, choose the Device Manager tab. Click the + sign next to the Ports item and other items such as the mouse and CD drive. A yellow circle with an exclamation point or a red "X" means you have a conflict. If so, change the COM port setting of your modem by double-clicking the Modems icon in the Control Panel, selecting your modem, clicking the Port drop-down control, and choosing a different COM port.
  Step 4:  Check the Phone Cords and Line

Double-check that the phone cords are plugged in properly, in their respective jacks, and secured into the modem, the telephone, and the wall jack. Also try making a phone call using the phone line you're using to be sure that the problem isn't with the line itself rather than with your modem.
  Step 5:  Re-seat the Internal Modem

Open up the case, making sure to first turn off all power, taking out the power cord and discharging any static electricity. Check to be sure that the modem is seated securely in the slot. If the connection isn't tight, the modem won't work.
  Step 6:  Check the External Plug

An external modem has to get electricity from the wall outlet in order to work. Be sure everything is plugged in and the modem is turned on. If it's not plugged in or turned on, it will not work. You'd be surprised at how often this is the cause of a modem problem. If your modem is plugged in and turned on, you should see lights lit up on it.