494      iPhone_iPad_Mac_apple

Mac Pro starts and black screen

I have a Mac Pro (mid 2010 2 x 3.46GHz 6-core Intel Xeon with 32GB RAM DDR3 – macOS Sierra 10.12.6) that have a strange behavior when starting. The Mac starts (Apple icon and loading bar). The loading bar goes up to 20 % than the screen becomes black but the computer still runs. To have access to the choice of the user, I have to press control+shift+eject (like to lock the computer) then a tip space and the screen with the user choice appears. I have the same behavior in safe mode and in recovery mode.

I have erased the computer and reinstall the OS completely (macOS Sierra 10.12.6). I have reset the NVRAM and SMC. I also went in single-user mode to run a disk check. Unfortunately, it does not solve the problem.

When I reset the NVRAM, I can start the Mac normally once after that, if I restart the computer, I get back the strange behavior.

Has someone any idea regarding this problem?

Thanks

最後更新：2017-09-19 23:49:18

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