can somebody point me in the right direction

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i have uno rev 3 board had accidental encounter 12+ volts somewhere underneath board, looked main chip overheated (small spot looks melted) anyway ordered 2 new chips fir atmega328 ebay , atmega328p digikey both supposed have bootloaders burned on them already, neither chip seems work when upload sketch "avrdude: stk500_getsync(): not in sync: resp=0x00" when plugin usb cable 3 rapid flashes pause again 3 rapid flashes or on off 1 second intervolts, yes tried loop test did not work

if loopback test doesn't work it's usb-to-serial broken.  if lucky it's firmware got fried , hardware still good.  if can use dfu process restore usb-to-serial:

http://arduino.cc/en/hacking/dfuprogramming8u2


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