Imac time machine obscured by black patch

When I use time machine everything appears to work correctly but most of the screen is obscured by a black patch. I attach a photo (taken with ipad) of the screen. I have tried shutting down and restarting but to no avail. I have no other problems with my imac.

If you have an external display connected, try disconnecting the external display and then use TM. I have a similar issue when using an HP external display, I was never able to locate a fix other than disconnecting the HP display.

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    Welcome to Apple Support Communities.
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    Message was edited by: kostby

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    Thanks for the suggestions.
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  • Time Machine observations

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    Well I am unsure as to why you are getting that flag, but it would be my guess that unmounting and re-mounting tells Time Machine to play it safe and assume that it has missed some file folder changes so it should re-evaluate the entire drive.
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    Message was edited by: ChunTzu

  • Time Machine stopped backing up, "preparing"

    Hi,
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    I've looked at the forums and on one suggestion deleted the com.apple.TimeMachine.plist file after disconnecting the drive and then reconnecting everything but to no avail. 
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    bb

    Bruce Bridges wrote:
    Starting standard backup
    Backup requested by user
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    Event store UUIDs don't match for volume: Macintosh HD
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    Those are all normal.  The last two mean that TM has to compare everything on your Mac to the backups, to figure out what's changed and needs to be backed-up.  That takes longer than a normal backup, but shouldn't take hours, unelss there's a problem with one of the drives, or the port, cable, etc.
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