The Apple 20" matte, silver-frame Cinema Display has three cables: a DVI cable, Firewire and USB. According to the Apple instructions, all three need to be connected to the MacBook Pro's ports. I used a DVI-to-MiniDisplay Port to connect the first DVI cable to the MBP's Mini-Display Port. I connected the USB. However, I did not connect the Firewire cable (because I didn't have a Firewire converter). And yet, the Cinema Display seems to work fine with just 2 out of the 3 cables connected. Why does Apple require all 3 cables to be connected, and am I potentially causing problems to the hardware? Or I am good to go with just 2 cables connected?