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can not renew IP address

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Can not renew IP address on an HP Compaq Presario 5000. The normal IP address process - run "cmd" then ipconfig/release, enter, then ipconfig/renew, then exit does not work. says unable to contact DHCP server. any suggestions?
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Describe your network please? Do you have a router or do you connect directly to your ISPs modem?
Did it ever work? If so, did you make any changes around the time it stopped working?
Have you tried the power reset process?
Power off modem, router, computer
Power on modem
Power on router
Power on computerWait for each one to settle down before moving on to the next.

If that doesn't help, click on Start then Run or press Window key (next to left Ctrl key) +R and paste the following into the Run box, exactly as shown, including double quotes:

cmd /c "ipconfig /all > postme.txt & ping yahoo.com >> postme.txt & notepad postme.txt & del postme.txt"

and press ENTER.

A file will open in Notepad. Please copy and paste the contents here. Close the Notepad window and the file will be deleted and the Command Prompt window will also close.

If you don't have a Run selection off the Start menu, see here: Enable Run Command on Windows 7 or Vista Start Menu, or just press Windows Key (next to the left Ctrl key) + R.
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