Mac desktop screen is black after sleep code#

In a 24-hour period, the “crash” has happened half a dozen times. The problem might involve a device on the Thunderbolt bus (using OWC Drive Dock and Thunderbolt Networking).

The problem seems to happen only after a good amount of time (e.g an hour or more).

There might be a time factor involved (sleep longer than X).

Choosing Sleep manually from the menu then waking-up the iMac 5K is fine, as is a short sleep period.

There may be wrinkles affecting things here:

Mac desktop screen is black after sleep code#

Yikes: disable sleep entirely, burning power and aging the display backlight, or effectively crash upon sleep? Clearly Apple has messed with the display code (see above 3-display discussion), introducing a new bug on a machine with only one display. The only fix is to cut power and reboot, e.g. The OS doesn’t crash it’s just that it is unusable since the screen stays black. Since then, if the iMac 5K goes to sleep mode (blank/black screen), the screen never again wakes up. The night before last, my iMac 5K was updated to OS X 10.11.3.

I’ve been running the late 2015 iMac 5K since Dec 24- zero issues. iMac 5K black screen - display stays black But it comes with a new and very bad bug on a single-display system-the iMac 5K. I can now use three displays reliably (so far at least). The OS X 10.11.3 release notes are terse, but one note states:įixes an issue that may prevent some Mac computers from waking from sleep when connected to certain 4K displays. SEND FEEDBACK Related: 4K and 5K display, Apple, Apple Core Rot, Apple macOS, iMac, iMac 5K, Jon M, Thunderbolt