Why the laptop does not see Wi-Fi network?

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Have a laptop Acer Extensa 5220 and the router D-Link DIR-620, which distributes Wi-Fi.
The router is configured on 802.11 b/g/n, WPA2-PSK (AES), the laptop must understand 802.11 g.

After setting up the router all devices have seen Wi-Fi network and worked with her. After off and on the router the laptop stopped seeing the network, while the other laptop and smartphone don't complain. Other network the laptop sees.

Tell me what could be the problem and where to dig?

UPD: Helped change channel from "auto" to a fixed. Thank you.
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5 Answers

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Had a similar problem on levelone.
DHCP on the router (IE he gives for the grid?)? If so, try to set fixed IP in mac. And check the lease time settings.
If you do not help, try on the laptop physically to register all network settings, without any autovideo.
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I have a similar problem is solved in this trick:
1. Turn off both devices: laptop and router.
2. Turn on the router, wait half a minute.
3. Turn on the laptop.
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I may not be quite the same, but close: after upgrading Fedora wireless network rises when you run. I restart network (service network restart). But I almost certainly a software problem.
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Put in the device a fixed channel (check whether your adapter on this channel, some nprimer can't work for 12), the channel is better not to put 5-6 TC in AUTO mode all devices work on it, and there is a high noise channel (if there are neighbors with wifi), put the 11th and try.
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Me too. thing happening with router D Link. Sometimes the laptop does not see it. But the same time see the hardware Apple smartphone, Apple I pod, Samsung Tab, Samsung smartphone. tech service did not help. He did not accept it as a defect because other aparatury work fine.
I turn off the camera, perevorachivayut its top on down, knock Paltz a few times, and turn on the same position. When apart already seen from Dell, then you'd get along right. Already in a row two router I got. But it's not okonchatelnoe decision.
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