Black flickering screen problem upon launch

When I boot up my MacBook (intel 2019 model) an error has started to pop up that I can't find the root of.

My entire screen, bar a few mm on the top, goes completely black. This happens only after I log in, and lasts a random amount of time between 5-10 minutes before disappearing completely, only to re-appear for brief periods when I'm using the laptop.


In the general settings, no apps start upon startup of the laptop, so I don't believe its that unless some apps can bypass that setting.

In safe mode the laptop launches fine. No black screen the entire time of usage.

I tried the other keyboard shortcuts that you're supposed to try during startup and they did nothing.

The error will always usually come back if the laptop goes to sleep mode or shutdown. Only after I log in. Only for a few minutes at a time. It is shorter when logging in from sleep mode then from completely powered down. Changing the brightness doesn't affect it/trigger it.


I will attach bellow a short list of the most common error lines I see come up in the Console during the black screen attacks if that helps at all.

Any advice would be greatly appreciated I'd love to fix this problem for good.


Console errors:

Invalid actual_host_time received from display: 0x4280f40  new time: 4434376083789 last time: 4434359420216

hid_event_callback: Invalid event type: 29

Missing CMContinuityCaptureCapabilitiesKey_Devices

No BeaconStoreActor available!

Sandbox: assistantd(578) deny(1) iokit-open-user-client AppleKeyStoreUserClient

Failed to open lockfile <private>: Error Domain=BiomeStorageError Code=2 "Wrong domain" UserInfo={NSLocalizedDescription=Wrong domain}


The invalid host time pops up almost non stop, the rest not so much.

Thank you in advance!

MacBook Pro 13″, macOS 26.0

Posted on Nov 7, 2025 3:33 PM

Reply
1 reply

Nov 11, 2025 8:30 AM in response to THEJUGGERNAUT720



verify your software is up to date—

The current stable release of Tahoe including bug fixes, security updates is macOS 26.1

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support



To be proactive you can file a bug report / submit your Apple Feedback here: Product Feedback - Apple



unplug all non-essential peripherals when testing

Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus

all known to cause issues on the macOS



For hardware issues take it in—


In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"

Genius Bar Reservation and Apple Support Options - Apple


Outside the USA

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Black flickering screen problem upon launch

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