WRT300N - My home network not visible on other home machines

I've had a WRT300N in place and problem-free for about two years; always able to have other laptops and notebook in the house view our network and able to connect. Suddenly, the network no longer shows on the other machines. The only thing I had done over the course of two or three days was to unplug the power cord from the back of the router (to prevent one of our children from using the wireless to access the internet late at night). So the most recent time I reconnect the power cord, local network no longer visible on the other machines. I have done a new set-up and a factory reset, and to no avail can I see the network on our other machines at home. When I run a hard cable from the router to the back of my laptop, I can gain internet access that way. I am puzzled why I can't see the wireless network any longer. The location of the router has not changed one inch, nor is there anything new posing interference. And as far as I can tell, the settings are all proper. I am not an expert when it comes to computer set-ups, but I was able to set-up the router and wireless on the first try two years ago; but now I have a problem. I would be grateful if anyone has any suggestions. Thank you.

Follow the below mentioned settings and check.
Open an Internet Explorer browser page on your wired computer(desktop).In the address bar type - 192.168.1.1 and press Enter...Leave Username blank & in Password use admin in lower case...
For Wireless Settings, please do the following : -
Click on the Wireless tab
- Here select manual configuration...Wireless Network mode should be mixed...
- Provide a unique name in the Wireless Network Name (SSID) box in order to differentiate your network from your neighbors network...
- Set the Radio Band to Standard-20MHz and change the Standard channel to 11-2.462GHz...Wireless SSID broadcast should be Enabled and then click on Save Settings...
Please make a note of Wireless Network Name (SSID) as this is the Network Identifier...
For Wireless Security : -
Click on the Sub tab under Wireless > Wireless Security...
Change the Wireless security mode to WPA, For Encryption, select TKIP...For Passphrase input your desired WPA Key. For example , MySecretKey , This will serve as your network key whenever you connect to your wireless network. Do NOT give this key to anyone and remember the key.
NOTE : Passphrase should be more that 8 characters...
Click on Advanced Wireless Settings
Change the Beacon Interval to 75,Change the Fragmentation Threshold to 2304,Change the RTS Threshold to 2304 and Click on Save Settings...
Now see if you can locate your Wireless Network and attempt to connect...

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Hello,
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Thanks for your reply. I have some computers with static IP physically assigned to them (not via home hub but on physically on the computer itself), when I go to Hub manager, advanced settings and home network, the device name with static IP are mapped to wrong IP, if i click on the name and change it, I then get errorr about the database. I am not talking about or refering to DHCP/DHCP table. My problem is with static IP I physically assigned to some devices but coming up on Home Network with a diffrent name mapped to assigned IP on those computer. Really I should be able to change the name to the right one and click on save.
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System B - IP 10.10.10.11 (Physically assigned on the machine)
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WRT300N - My home network not visible on other home machines

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