If your power IC is dead then you'd have to either replace the entire board or become a robot and solder on a new one. HOWEVER, try this: take out your battery, put it back in, hold both volume down+volume up and plug in a USB cable. If your phone boots into download mode then all is not lost! [http://www.ebay.com/itm/WORKING-MOTHERBOARD-Samsung-Google-Nexus-S-SPH-D720-Sprint-OEM-CLEAN-ESN-/331020018764?pt=US_Cell_Phone_Replacement_Parts_Tools&hash=item4d1254a44c|Here] is a new motherboard if you're intent on fixing this phone (provided it is a Sprint Nexus S), or [http://swappa.com|swappa] has a phenomenal array of smartphones for cheap.
Cheers,
tabormeister