iMac doesn't shut down sometimes

Joined
May 24, 2011
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Location
New York City
Your Mac's Specs
MacBook Pro 16 Inch 2019 MacOS Catalina 10.15.3 (19D76)
Once in a while my iMac, OS X Yosemite will not shut down when I choose the shut down options. Other times, I can't even find the upper tab bar to shut it down. I have to manually turn off the button behind the monitor. I do have an external Dell that runs off of the iMac. Does anyone have a remedy for this?
 
M

MacInWin

Guest
1. What is an External Dell?
2. What iMac?
3. Anything else attached?
4. Any messages?
5. What else are you leaving out?

Please read the link in my sig and post again.
 
Joined
May 18, 2008
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Location
Amberley, Canterbury, New Zealand
Your Mac's Specs
MacMini 14.3, 8.1 & 4.1, OS 13.5, 10.14, & 10.11 & 10.6; Macbook Pro 8.2, OS 10.12.
Try repairing disk permissions. The best utility for this is OnyX from Titanium Software, although you can use Disk Utility from MacOS itself.
 

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