I almost never reboot this Mac. Lately I noticed after a system freeze that the Mac would not boot, instead the Mac boot process hangs at a black screen.
Regression:
- Unplugging the USB devices immediately continues the boot process to the gray screen with the Apple logo.
- Because 2 USB hubs are attached I tried to isolate, by moving all USB devices to one USB hub and then to the other, no improvement.
- Tried to isolate the individual USB devices, boot still fails.
How to fix the boot process of my Mac?
Best Answer
After a few hours of fiddling with USB and USB devices I found the solution.
In "Apple menu" > "System Preferences" > "Startup Disk" there was no longer a disk selected that I would like to use to start up my computer from.
After selecting the corresponding Mac OS X system, I could reliably reboot again, without pausing/hanging at the black screen during boot.