[AC Question]

nexus 5 . screen became black and no response

[B. Diddy]

Welcome to Android Central! It sounds like it's off already--do you mean you want to turn it on using your computer? If the phone is dead, that probably won't help. Have you tried pressing and holding the power button for at least 10-15 seconds? Or booting into Recovery Mode? http://forums.androidcentral.com/nex...-recovery.html