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HP Notebook PCs - Solve Internet or LAN Connection Issues When Using an Ethernet Cable to Connect to a Router or Modem (Windows Vista and XP)

A computer connected to the Internet using an Ethernet cable may occasionally lose its connection to the Internet. The computer may be connected directly to a cable service modem or DSL modem, or there may be a router between the computer and the modem. While some of the tasks listed below will resolve problems if the computer has lost its connection to other network computers, network storage devices, or network printers, this document primarily addresses a lost Internet connection.
 note:
Most of the troubleshooting steps below are quick and easy to perform. However, before you perform the Advanced Network Troubleshooting or try to download and install drivers or programs on your computer, try connecting another computer to the network to verify the problem is with the computer rather than a network issue.
Never connected
If the computer was never successfully connected to a network or the Internet, contact your Internet Service Provider (ISP) for a wired LAN installation program and instructions, or see one of the following documents:
Wireless Connection
If the computer has lost a network or Internet connection on a wireless network, see one of the following documents:
Do this first
There are some simple troubleshooting steps you can perform before beginning the manual or advanced troubleshooting sections. These simple troubleshooting steps can solve many network and Internet connectivity issues.
Manual Troubleshooting
You can manually troubleshoot Internet connection problems by completing the following tasks in the sequence they are listed.
Advanced Network Troubleshooting
If the computer cannot connect to the Internet after doing the quick network checks and the manual troubleshooting, you can complete one or more of the following advanced troubleshooting procedures. You may want to use a different computer to search the HP User support forums for similar network connection problems.

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