Just replaced a bad battery, here's the phone's current behavior:
* No reaction from screen on power up
* Pressing the power button causes a single vibration
* Turning on a bluetooth headset that was paired to it and nothing else in it's life results in a 'connected' declaration.
** Ran around and confirmed that nothing else had picked it up anyway
* Removing the charging cable and letting the phone sit for a while to drain resulted in it not vibrating when pressing the power button until I plugged it back into the charger.
I'm suspecting that I accidentally killed the screen when replacing the battery, but would like to hear if there were other checks I can perform or other possible theories.