Notice: There are two different connector for the Apple laptop, one is Mini DVI which is for the old version, and another is Mini displayport which is for the new version 

Please check your manual and confirm that the connector of your Macbook is Mini Displayport Port 

The Mini DisplayPort to HDMI Adapter converter is used for the new and future generation DisplayPort based MacBook, MacBook Pro, or MacBook Air with a Mini DisplayPort to high definition displays. Since Mini DisplayPort offers a unified, scalable, and cost effective interface for embedded and external display applications, it offers solutions for digital entertainment center, HDTV retail and show site, HDTV, STB, DVD and Projector factory, noise space and security concerns, data center control, information distribution, conference room presentation, school and corporate training environments. 

   Brand New 
   Plug and Play 
   Input Type: Mini Dislay Port (Male) 
   Output Type: HDMI (Female) 
   Support Mini DisplayPort 1.1a input and HDMI output 
   Support HDMI highest video resolution 1080p 
   Supports up to 1080p, 1920 X 1200 reduced blanking video resolution 
   This Mini Display Port to HDMI Adapter / coverter can be used with all version HDMI cables including the new HDMI v 1.3b 
   Length: 15cm