Stand-by button on Cinema HD display doesn't work after Mountain Lion upgrade

Hi,
After I upgraded my Mac mini (spring '09) to Mountain Lion it appears that the buttons on the side of my Cinema HD display doesn't work. There is a setting in sys preferences that should put the Mac in stand-by when the power button is pressed. This doesn't work after I upgraded to OSX 10.8 Mountain Lion.
Does anyone have similar experience. Anyway to fix it?
Thanks,
Henrik

Have done some further investigating (to no avail). The TV is displaying in my system Info as follows:
Intel HD Graphics 3000:
Chipset Model: Intel HD Graphics 3000
Type: GPU
Bus: Built-In
VRAM (Total): 384 MB
Vendor: Intel (0x8086)
Device ID: 0x0116
Revision ID: 0x0009
Displays:
Color LCD:
Display Type: LCD
Resolution: 1440 x 900
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Connection Type: DisplayPort
TOSHIBA-TV:
Resolution: 1920 x 1080 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Mirror: Off
Online: Yes
Rotation: Supported
Television: Yes
But nothing on the screen.
Does anyone know if Apple have banned certain screens????

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