Why is my router not broadcasting wireless signal?

CONTINUAL DISCONNECTION OF WIRELESS CONNECTION

There are a few things that can cause you to lose wireless connection with your wireless router.
1. Weak signal strength, check the signal strength on your wireless card. If it is weak move the wireless router away from brick or concrete walls, mirrors, fish tanks and if possible locate the wireless router higher up.
2. Have you secured your wireless router from people near your from unauthorized access? i.e. change the default password, setup encryption use WPA2 or WPA, change the default SSID, and turn off SSID broadcast, and for added protection, enable MAC address filtering which allows only the MAC address/es of your wireless card/s to connect to your wireless router.
3. You could be getting interference from electrical sources such as air conditioners, arc welders, washing machines etc. If so, the power supply to the wireless routers and computers etc should be connected to a surge protection power board, better still connect your computer equipment to an UPS (Uninterrupted Power Supply).
4. Check the channels of the wireless routers and access points in your area and change the broadcast channel on your wireless router to an unused channel or one that is currently used but has the weakest signal strength. This will minimize interference with your wireless router from other wireless routers and access points in your area.

You have to go to the wireless tab or Wireless security inside the router and select to Enable Wireless in order for it to broadcast the signal.

LOSING WIRELESS CONNECTION
Make sure the latestwireless card driver is installed in the computer.Locate the wireless routerhigher and away from concrete and brick walls, foil-insulated walls. Locate the wireless routeraway from cordless phones and microwave ovens these can cause interference.You could be gettinginterference from other wireless access points or wireless routers in yourarea. Check the wireless broadcast channels in your area, and select one thatis unused or one that has the weakest signal strength.CONTINUAL DISCONNECTION OF WIRELESS CONNECTION
There are a few things thatcan cause you to lose wireless connection with your wireless router.1. Weak signal strength,check the signal strength on your wireless card. If it is weak move thewireless router away from brick or concrete walls and if possible locatethe wireless router higher up.2. Have you secured yourwireless router from people near your from unauthorized access? i.e. change thedefault password, setup encryption use WPA2 or WPA, change the default SSID,and turn off SSID broadcast, and for added protection, enable MAC addressfiltering which allows only the MAC address/es of your wireless card/s toconnect to your wireless router.3. You could be gettinginterference from electrical sources such as air conditioners, arc welders,washing machines etc. If so, the power supply to the wireless routers andcomputers etc should be connected to a surge protection power board, betterstill connect your computer equipment to an UPS (Uninterrupted PowerSupply). 4. Check the channels ofthe wireless routers and access points in your area and change the broadcastchannel on your wireless router to an unused channel or one that is currentlyused but has the weakest signal strength. This will minimize interferencewith your wireless router from other wireless routers and accesspoints in your area.

If you are having problems receiving a decent signal , then try changing the channel the wireless is broadcast on your router if that fails to improve things your only other option is to buy a range extender. Thiis will be paired with your wireless network and then it will transmit the signal further

Reconfigure the router. It seems that it has been reset.

By default, wireless routers always broadcast wifi signal. The only thing you need to do is to enable the wifi radio receiver of your laptop. To do it, make sure that you have the wifi LED lit in your laptop which means that your wifi receiver is ON. Now, you need to connect your modem to your router so that your router will then broadcast internet signal. Then you are good to go. Your laptop should get connected automatically and receive internet signal.

If you want to configure your router, visit http://192.168.1.1 when you are connected to the network so that you can change some of your router's behavior.

Turn off or move any other gadgets that may emit a wireless signal. Other wireless signals may prevent the router signal from being as strong as it should be

you said that you can see the wireless network but it shows as unknown network
I think SSID broadcast on your wireless network must be disabled.
You will need to enable the SSID broadcast of your network.
Also try to change the wireless channel on the router.
WRT54G router's IP address will be 192.168.1.1. if you have not changed it.
Do you have any other computer connected to the router woth the ethernet cable ?
If you do not have the computer connected to the route then connect 1 computer to the rotuer with the ethernet cable.
Do not change any wireless setting on the wireless computer.
You will need to open the set up page of the router
Click Here for more info about how to change the wireless settings

You can first access the router setup page and change the wireless channel to the highest value to broadcast stronger signal but if that doesn't correct the problem do a firmware upgrade on your router............

Hi! It's ok to disable the wireless broadcast of the router however, it wont stop the router from broadcasting the wireless frequency. It will only hide itself from the people who are trying to connect to a free signal that are available.