Laptop Wifi Signal Problem [Help]

I was sitting in my hall and booted up my laptop then i noticed my laptop not detecting any router so i took my laptop near wifi and then it connected but early i had a good detection many user of my residential building were detected but now none till i dont go near my wifi,
I tried system restore , reset router, reset adapter with troubleshooter but my laptop has very weak signal tried changing channel of 192.168.1.1 also
i guess problem with my laptop adapter HELP ME!!

 

http://imageshack.us/a/img546/9426/ezytoshareblogspotcomk.jpg
I Solved the Problem Myself when i was checking laptop the porblem was with the wire removed which i put it back in

i Solved two things today wifi and power so i posted informative solution by image on how i solved it