I'm kind of new to Mac Rumors so bear with me Using MacBook Pro bought in 2011, OS X 10.6.8, 2.7 GHZ Intel Core i7, 8GB 1333 MHZ DDR3 Seeing how adapters are expensive, I looked for a multiple link adapter. So I bought this: http://www.rakuten.com/prod/thunder...i-dvi-display-port-adapter-for/245429486.html HDMI port works. DisplayPort I'm not sure if i'll ever use it, haven't tested it so I couldn't say if it functions or not... but the DVI is a little funky. I dont have a DVI cable to test it on, so I bought this as well: http://www.newegg.com/Product/Product.aspx?Item=N82E16814998101 My Laptop display reacts and detects when I plug it in, but then goes back to normal. The external monitor is a Dell E153FP. My Professor has an earlier mac laptop and his Apple-made display to VGA works on it just fine. Mine however, does not. Did I screw up buying an adapter that doesn't support digital to analog or something? I feel like there are thousands of versions of DVI connectors.