Solved Mac Pro 2006 Power Supply Replace Mac Pro First Generation
Chosen Solution My Mac Pro just switched off, and its not coming back on, its dead! After googling it people say it could be the logic board, but most likely the power unit its about 6 years old, i got a second hdd installed before, worked fine but then the mac would not start up (flashing question mark) seems to be a common enough issue but that was resolved, the hdd was not installed correctly....