OK just a quick note this one but it might help some people out.
The other day it seemed that my beloved Nexus 4 suffered from the red light of death. The battery had died overnight. I plugged the phone in at work, it normally leave it connected to my PC there during the day and it does charge. However in this case, it just wouldn't turn on and I kept getting the red light of death. It was showing the charging animation still.
I plugged it into a supposed 1 amp power supply (which I normally use with a Raspberry Pi) but it still wouldn't turn on which had me worried.
Long story short, when I got home I connected the proper charger up (well actually my nexus 7 charger) and it came back to life!
So if you seem to have the red light of death problem make sure you are using a decent charger - ideally the original nexus 4 one or better. The 1 amp PSU I had at work clearly isn't really capable of supplying 1 amp.
