I had the exact same problem. My E2 was only 2 weeks old! None of the reset options worked. I charged and trickle charged but nothing worked. Palm said to send it back...
I searched the forums and saw a link suggesting taking it apart and disconnecting the battery momentarily. I did and it worked!!!
Directions for taking it apart are at http://www.gethightech.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=GHT&Category_Code=_TungEBat
but they are for the E, not the E2. A few small differences and one big one. The E2 doesn't require soldering to disconnect and reconnect the battery. Just pry off the plastic piece from the motherboard and push it back on when your ready to reconnect.