Hello, recently my Macbook pro (late 2013, Retina) 13", made a silent "puuk" sound and the display stopped working. Apple...

Remove & insert again the CMOS battery, this will erase firmware memory. If nothing will change, flash a new Envy firmware. There is almost zero probability, that incorrect program is sitting there right now if the computer is working. But indeed, this is a weird situation.

Enter SSID (network name) by hand to connect it.