My cord came today and it doesn't fit the MBP....I have a 23" Asus monitor, and it's HDMI. Hubby thought he knew which cord to get and I've been waiting anxiously for it and of course when it arrived today, the end that goes into the MBP is too small. The monitor also has built in speakers, which i will be using. So, can you tell me which adaptor I need? Pretty please?