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powers up but no display

Hello,I just used one of the step by step guides to replace the dc-in board.That now works fine hooray.However even though the machine powers up the display is black.I tried turning brightness up via keyboard and took the machine apart partially to check I reconnected all the right bits.I'm no expert so do not even know what cables even relate to the display,any help much appreciated.

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double check all the ribbon cables and other connectors, perhaps one of the ones in step 39 of the repair guide - sorry I forget exactly which cable goes to the display, it's been a while since I opened this model PowerBook...

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dean 将永远感激不已
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