Originally Posted by jayram1408
Now it wont even light up, turn on, charge, NADA. Does this mean its toast? Nothing.
What exactly was it that you attempted? Did you charge it before you did anything?
You might try pulling the battery, wait a couple seconds, press each of the mechanical buttons (vol-up/down, send, trackball, end) once, and re-insert the battery, and put it on the charger. (This is a very long shot, probably will do nothing.)
Note that if you left the phone sitting in HBOOT, FASTBOOT, RUU mode, or a bootloop the battery can discharge even if you have it plugged into a USB hub. IIRC Li-Ion battery packs have a safety circuit that prevents charging if the battery charge (voltage) level drops too low.
It is possible that you simply have a dead battery that can not be recharged. Not easy to tell if that is the case, though - if you plug an Eris in to a charger without its battery, it won't start up in any mode even though there is (in principle) sufficient voltage/current (I just tried it on a working Eris). About the only way to know for sure is to see whether it's the phone or the battery is if it will go into any mode with a known-good battery.
I just measured the open-terminal voltage on a charged Eris battery - 4.11 V