At my home I have wireless Access point for my laptop to access internet. Tomorrow suddenly it stopped working. I tried to reboot, changed channel, changed settings of my laptop but it does not appear. When I search for wireless network, it show no network.

It is also not showing in friend's laptop which I bought to check . What I do now ?

It just stopped all of sudden.

With time AP tends to get weak. You may try to change channel and if that don't work, try changing encryption method.

Press the small reset button on it with a pen..

Re-enter the configs.