I forgot to charge my phone on overnight and I know the battery was low already.
I woke up this morning to find the phone dead (expected)
I brought my USB cable to work so that I could charge it off my laptop during the day. The phone refuses to turn on (the small white LED on the side of the phone tells me the USB was providing power)
Pulling the battery, even attempting a hard reset got me a black screen.
I went out to my car and tried using the car charger and the phone turned on instantly.
So FYI for those of you who can't get your phone to turn on...if you're using a PC to charge the phone try using a wall charger. Apparently it makes a difference. I left my phone in the car to charge the rest of the morning.