Gents, I bought a refurbished mBP 2011 off eBay this Monday24th but only received it on Thursday 27th , I regret it it turns out that I may have bought a lemon. When I plug in a cable into firewire port, there is NO VIDEO, but there is audio. Is this a sign that the graphics card is beginning to fail??? The seller has said "check the port for dust", I have already done it Please advise, I have a few days to return it. Thank you. Johnrho.