@judith75 here is the pinout for the connector from the power supply
Pins 1,2,3,4,5
|+24.5VDC|-24.5VDC|SENSE|-24.5VDC|+24.5VDC|
|+24.5VDC|-24.5VDC|SENSE|-24.5VDC|+24.5VDC|
Pins 6,7,8,9,10
and a whole lot of information about this on here. If your power supply is okay you will have to open the display and check for secure connections at TMDS, Panel Power, J703, J701, J702, J12, CN1, CN2, CN3, CN4 and CN5.
Plug the display into a known-good computer, then boot the computer.
Verify +24-28V at input of J702. If not, replace ADC cable.
Verify +24-28V at pin 10 of J701. If not, replace the main board.
Verify +5V at pin 11 of J703. If not, replace the main board.
Verify +18V at pin 6 of J703. If not, replace the main board.check
This should at least get you there Apple Cinema HD Display 30" Teardown
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