There are 2 versions (at least) of the 17" acrylic display, one with the clear video cable and one with the white cable, as well as other differences like graphite or silver Apple logos. They have different firmware, so some respond to USB on a Cube, some don't, and some are even more weird with G5s and Intel Macs. They are pretty easy to work on, and you can get them cheap sometimes since they won't work on new Macs or PCs without the $100 power brick from Apple. Most of the "dead" ones have burnt out transformers in the inverter for the LCD backlight. I fixed four with dead backlights using transformers from one with a cracked screen (each has 4 fluorescent tubes and 4 transformers). In any case, they are typical top-line Apple displays with IPS panels and excellent color rendition. What they lack is 16:9 screen format and HDCP, so they are useless for HD content, even 720p from iTunes.