オリジナル投稿者： pierrej ,
for an early 2009 (there are no mid 2009 Mac Pros) you can replace the front panel board. Apple part number 922-8889. Alternatively, please check all connectors on the front panel cable. it's part number is 922-8888 if you find one cable not showing connectivity. To replace it, first remove the hard drive in bay 1, then your graphics card, the PCIe fan, the processor tray and processor cage. This should give you enough space to replace the front panel board. If this does not make a difference, then you might have an issue with the logic board.