If your wireless connection suddenly stops working, it's highly possible that you or one of your students has accidentally turned the wireless card power switch off.
Elementary D630 laptops - You'll find the switch by the headphone plug in jack
|1||"off" position||Disables wireless devices|
|2||"on" position||Enables wireless devices|
|3||"momentary" position||Scans for WLAN networks|
Elementary Netbook Cart - The physical switch is on the left side, slide the switch back toward the broadcasting PC to turn it on. The picture shows it in the OFF position. The Fn + F8 key will also enable/disable wireless if the physical switch is ON.
Library Cart Lenovo Edge 15 - The switch is a soft switch activated by the red Fn key + F8.