Apple 661-3356 Power Adapter, 150 W for 20, 23 and 30 inch Cinema Display - A1098 - Apple Power Adapters 661-3356 - Cinema Display (30-inch DVI Late 2005-2007) Power Adapter, 150 Watts. Note: This Power Adapter is backward compatible for Apple Cinema Display 20 and 23-inch. Power cord (922-6529) are sold separately.
150W 30-inch Cinema Display power supply also can be used with 23-inch Cinema display. We came across couple of 23-inch Apple Cinema Displays which didn't want to turn on with 23-inch power adapter. If your 23-inch Cinema Display does not respond to 90