I am considering buying a used gtx 570 from craigslist. The owner has put a huge price drop on it and it would be an amazing deal for me ( a poor high school student making his first build). The owner has stated that the only issue is "The only issue that i've had with it is the first time i try to power the computer on it won't post, so i shut it off and turn it back on and then it runs flawlessly." is this something i should be concerned about with the video card or is it most likely a flaw with a different part in his system? Should i buy this card?