HT1338 Mac mini display connection will not come back after sleep, I have to shut down and restart the monitor.

Mac mini display connection will not come back after sleep, I have to shut down and restart the monitor.

Finder icon on dock, macintosh hd, library, launch agent - delete all files & restart sleep to test
also
Finder icon on dock, macintosh hd,
Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
delete file & restart sleep to test.

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