How to restart wp540?

Press and hold the power/lock button for a few seconds. The "slide down to power off" screen will keep moving up and down. Ignore it. After a few seconds, most probably 8-10 seconds, the screen will go blank and your phone will shutdown. Don't release the power/lock button at this point. Keep holding it for few more seconds and the phone will vibrate, indicating that it has started up. Now you can release the power/lock button. Your phone has restarted. :smile:

Hope that helps.

PS:- Some might ask you to hold the Volume down button along with power/lock button also. But that is not needed for the newer Lumia phones like 540, 830, 730/35, 640/XL, 535, etc. Just the power button is sufficient.