Was that big scratch already there?
The easiest thing to do is buy a pre=programmed Atmega328p-pu chip from Sparkfun, Adafruit or one of those sites. If you buy a bare chip, you'll need the bootloader on it which you won't be able to do without a programmer or another functioning arduino.
I scratch the board while trying to make sure there is no shorting between the copper.
It worries me to put a new Atmega328p-pu chip onto the board because when plug into the usb the chip gets HOT. If I remove the Atmega328 and replug the usb the LMV328 get HOT.