Sign-in issue on iMac after waking up from sleep mode

Question

Level 1

4 points

Sign-in issue on iMac after waking up from sleep mode

1.When I awakened computer from Sleep mode, got a screen that was 60% black on top and bottom 40% displayed only date and time on Sequoia backgound. Could not sign in or anything.

2.Force closed, waited then re-opened with same results.

[Re-Titled by Moderator]

Original Title: Can't signin on iMac

iMac 27″, macOS 15.6

Posted on Aug 27, 2025 9:16 AM

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Answer 1

rkaufmann87

Level 10

148,452 points

Aug 28, 2025 5:40 AM in response to jcoll152

Most experienced users do not use the Sleep feature as it causes problems. There is a work around that you can use that yields the same net results:

Click the Apple Symbol in the upper left of the display and select System Settings
Click Lock Screen on the side bar.
Select Turn Display off When Inactive and select the amount of time you want. (I have mine set for 3 minutes but you can select from 1 minute to 3 hours) .
Quit System Settings and test. (Note if you have a problem please restart in Safe Mode using Safe Mode instructions) and then restart normally and re-test).

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Answer 2

tbirdvet

Level 6

17,078 points

Aug 28, 2025 10:48 AM in response to jcoll152

+1 what rkaufmann87 stated. All kinds of issues when using the sleep function.

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Sign-in issue on iMac after waking up from sleep mode

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