So I saw that someone was selling a GTX 980 but apparently, it doesn't work. According to the seller, it does not display at all. So I took a gamble and decided to bet on it. I won hoping maybe it would be an easy fix. I plan to use it on an SLI config because I already have a gtx 980 on my current rig. So trying to figure out what's wrong with it based on looking at the pictures, I noticed these unusual spots on the back of the PCB. Not sure if it's either rust or corrosion. The seller placed odd stickers with arrows indicating the spots so I am really hoping it isn't too bad to fix. Please Help!!