Wireless Networks Disappear

My macbook will connect to my wireless network and display all nearby networks then every wireless network disappears and cannot connect. My phone can still connect to my network. My phone also displays all nearby networks. If I take battery out of computer and hold power for 5 seconds it will work for a little while then repeats issue. Please help
Best to completely unplug everything, then starting from the wall work outwards - first plug in modem and allow to power-up, next plug in router and allow it to power-up, then connect router to modem - finally plug in Mac and restart it, turn on AirPort and it should automatically connect your Mac to your secure wireless network - unless you have your network setup differently so that you would be expecting something different.