Ok. After much procrastination, I returned to get the Nexus 7 charger that came with the unit. My brother had told me he was using a phone charger. My initial assumption was that using the phone charger would not have been an issue. Micro USB is Micro USB to me. Anyway I charged the unit for 30 minutes with the unit's charger and held the button for 30 seconds. The Nexus booted up and I have since returned it to its home.