Network Problems; Mobile Broadband (Wireless Wide Area Network [Wwan]); Power Problems - Dell Inspiron 1521 Owner's Manual

Save and close any open files and exit any open programs you are not using to see if that resolves the problem.
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See the software documentation for minimum memory requirements. If necessary, install additional memory (see Memory).
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Reseat the memory modules to ensure that your computer is successfully communicating with the memory (see Memory).
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Run the Dell Diagnostics (see
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If you experience other memory problems —
Reseat the memory modules to ensure that your computer is successfully communicating with the memory (see Memory).
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Ensure that you are following the memory installation guidelines (see Memory).
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Run the Dell Diagnostics (see
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Network Problems
Fill out the Diagnostics Checklist as you complete these checks.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
Check the network cable connector —
Ensure that the network cable is firmly inserted into both the network connector on the back of the computer and the network jack.
Check the network lights on the network connector —
No light indicates that no network communication exists. Replace the network cable.
Restart the computer and log on to the network again
Check your network settings —
Contact your network administrator or the person who set up your network to verify that your network settings are correct and that the network is
functioning.

Mobile Broadband (Wireless Wide Area Network [WWAN])

NOTE: The Dell Mobile Broadband Card Utility user's guide and the Mobile Broadband ExpressCard user's guide are available through Windows Help and
Support (click Start ® Help and Support). You can also download the Dell Mobile Broadband Card Utility user's guide from support.dell.com.
NOTE: The icon appears in the notification area if the computer has a Dell WWAN device installed. Double-click the icon to launch the utility.
Activate the Mobile Broadband ExpressCard —
You must activate the Mobile Broadband ExpressCard before you can connect to the network. Position the mouse over the
verify the status of the connection. If the card is not activated, follow the card activation instructions located within the Dell Mobile Broadband Card Utility. To
access the utility, double-click the
the manufacturer's instructions for your card.
Check network connection status in the Dell Mobile Broadband Card Utility —
Double-click the icon to launch the Dell Mobile Broadband Card Utility. Check the status in the main window:
No card detected — Restart the computer, and launch the Dell Mobile Broadband Card Utility again.
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Check your WWAN service — Contact your cellular service provider to verify your plan coverage and supported services.
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Power Problems
Fill out the Diagnostics Checklist as you complete these checks.
Dell Diagnostics).
Dell Diagnostics).
icon located in the taskbar, at the lower-right corner of your screen. If your ExpressCard is not a Dell-branded card, see
icon in the notification area to