So, have you tried to charge the phone yet?
When you plug it in, either to the wall charger or to a computer through a USB cable, does the little red light come on?
With the battery charged and turning the phone on, does it do ANYTHING?
If it truly will not do ANYTHING, you most likely DO have a dead phone - but this is not a common occurance.
Current: Verizon Samsung Galaxy Note II - running the unparalleled Jelly 'Beans' - Build 18 with the Sabre kernel
Previous: Droid Bionic, Droid Charge, HTC Imagio, Samsung SCH-i760, Palm Treo, HTC JasJar, HTC MDA II, HP iPAQ 1615, Casio Cassiopeia A20 & E105