LED Cinema Display (27-inch): Troubleshooting no video issues when using DVI video ports

You can connect your LED Cinema Display (27-inch) to any of the current Mac computers with a Mini DisplayPort running Mac OS X v10.6.4 or later. Using the LED Cinema Display (27-inch) with older Macs that have DVI video cards is not supported by Apple, although there may be DVI to Mini DisplayPort adapters made by other manufacturers that may work. Learn tips for using a suitable adapter.