You have _THREE_ separate network connections to check:
1. your router, through your ADSL modem, to your ISP;
2. your computer, through an Ethernet cable, to your router;
3. your computer, through its wireless adapter, to the wireless adapter in your router.
So:
1. Connect the Ethernet cable from your laptop directly to your ADSL modem, bypassing the router.
Turn the router off.
Restart the modem.
Restart the computer.
Click Start
Click Run
Enter CMD and press ENTER
Enter IPCONFIG and press ENTER
You should get output like:
Ethernet adapter Local Area Connection:
* IP Address. . . . . . . . . . . . : 123.456.789.249
* Default Gateway . . . . . . . . . : 123.456.789.1
* Subnet Mask . . . . . . . . . . . : 255.255.255.0
Enter PING 123.456.789.1 and press ENTER
If PING does not respond, then telephone your ISP, and get them to trouble-shoot your connection.
2. Turn off the ADSL modem.
Connect the Ethernet cable from your laptop to one of the LAN ports on the router.
Turn the router on.
Restart your computer.
Click Start
Click Run
Enter CMD and press ENTER
Enter IPCONFIG and press ENTER
You should get output like:
Ethernet adapter Local Area Connection:
* IP Address. . . . . . . . . . . . : 192.168.0.100
* Default Gateway . . . . . . . . . : 192.168.0.1
* Subnet Mask . . . . . . . . . . . : 255.255.255.0
Enter PING 192.168.0.1 and press ENTER
If PING does not respond, then your router is not working.
If PING does respond, connect another Ethernet cable from the WAN port on the router to the ADSL modem.
Turn the modem on, and wait until the flashing-lights on the modem, and on the router, settle-down to a steady pattern.
Type PING
WWW.GOOGLE.COM and press ENTER.
If PING responds, then everything is fine.
3. If you fix #1 and #2, above, then your wireless adapter should work.
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