My Lenovo A6000 power button is not working and I am unable to start up the phone. what do I do?
Try this: Open the back cover first. Plug in your phone to a charger, once it shows it is charging, disconnect the charger and quickly reinstall the battery.
If that doesn't work, try press and holding volume up button then plug in your phone to the charger, then press and hold home button. Phone should show you options to boot, choose normal.
Hope that helps!