NOTE: Do not plug a telephone cable into the network adapter connector (see Back I/O Connectors).

Check the Microsoft Outlook® Express security settings — If you cannot open your e-mail attachments:

1.In Outlook Express, click ToolsOptionsSecurity.

2.Click Do not allow attachments to remove the checkmark, as needed.

Check the telephone line connection

Check the telephone jack

Connect the modem directly to the telephone wall jack

Use a different telephone line —

Verify that the telephone line is connected to the jack on the modem (the jack has either a green label or a connector-shaped icon next to it).

Ensure that you hear a click when you insert the telephone line connector into the modem.

Disconnect the telephone line from the modem and connect it to a telephone, then listen for a dial tone.

If you have other telephone devices sharing the line, such as an answering machine, fax machine, surge protector, or line splitter, bypass them and use the telephone to connect the modem directly to the telephone wall jack. If you are using a line that is 3 meters (10 feet) or more in length, try a shorter one.

Run the Modem diagnostic Tool —

Windows XP:

1.Click StartAll ProgramsModem Helper.

2.Follow the instructions on the screen to identify and resolve modem problems. Modem Helper is not available on certain computers.

Windows Vista:

1.Click Start All ProgramsModem Diagnostic Tool.

2.Follow the instructions on the screen to identify and resolve modem problems. Modem diagnostics are not available on all computers.

Verify that the modem is communicating with Windows —

Windows XP:

1.Click StartControl PanelPrinters and Other HardwarePhone and Modem OptionsModems.

2.Click the COM port for your modemPropertiesDiagnosticsQuery Modem to verify that the modem is communicating with Windows.

If all commands receive responses, the modem is operating properly.

Windows Vista:

1.Click Start Control PanelHardware and SoundPhone and Modem OptionsModems.

2.Click the COM port for your modemProperties DiagnosticsQuery Modem to verify that the modem is communicating with Windows.

If all commands receive responses, the modem is operating properly.

Ensure that you are connected to the Internet — Ensure that you have subscribed to an Internet provider. With the Outlook Express e-mail program open, click File. If Work Offline has a checkmark next to it, click the checkmark to remove it and connect to the Internet. For help, contact your Internet service provider.

Error Messages

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

If the error message is not listed, see the documentation for the operating system or the program that was running when the message appeared.

A filename cannot contain any of the following characters: \ / : * ? " < > — Do not use these characters in filenames.

A required .DLL file was not found — The program that you are trying to open is missing an essential file. To remove and then reinstall the program:

Windows XP:

1.Click StartControl PanelAdd or Remove ProgramsPrograms and Features.

2.Select the program you want to remove.

3.Click Uninstall.

4.See the program documentation for installation instructions.

Windows Vista:

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Dell 720H2C Error Messages, Click Start→ All Programs→ Modem Helper, Click Start → All Programs→ Modem Diagnostic Tool