I'm sorry, please try this:
1. Disconnect the power cord from your netgear modem/router DGN2200 device for about 5 minutes, then reconnect, then wait a couple of minutes.
2. Make sure there is an Ethernet/network cable connected from the working computer to the Netgear device.
3. Press & hold the reset button at the back of the netgear device for about 10 seconds, then wait a few minutes, then check.
Note: If the internet stops working on the working computer after resetting the netgear device, then on that computer, go to the netgear modem/router device's website at :
(Or website http://www.routerlogin.net or http://www.routerlogin.com)
(even there is no internet access, the router's website still works)
, then login with username; admin and password; password
, then run the internet setup wizard there.
Please click on the Reply to Expert tab below, and reply back to me, so I can help further if there is still any issue. Thank you,