Hi, I have an early 2011 MacBook Pro 13" (base model) that I use with a mini displayport to HDMI adaptor. It all works fine except that my HDMI cable stopped working and I went ahead and bought a new one. The new HDMI cable works fine with my PS3 and PC but doesn't work with my MacBook Pro. My MacBook detects the external display but doesn't show anything on it. I know that the adaptor isn't broken because I have a HDMI to DVI cable that I use with a monitor. I'm confused as to what could be the problem.