Mac mini dual display - blue screen flashes frequently

I recently purchased a mac mini i7 model, with fusion drive.
I have upgraded the RAM to 16GB.
I have also purchased 2 monitors, both are LG 22EA63V LED.
I connected one monitor direct HDMI to HDMI.
The other monitor is connected from Thunderbolt to HDMI.
Everything worked amazingly well for the first few weeks. Now, not so much....
I frequently have the screen freeze and flash blue, and then resume as normal dual display mode.
Other times the screen will flash blue and then come back as a single display. In this case the Thunderbolt to HDMI display appears as primary display, while the HDMI display loses connection.
If I unplug the HDMI display completely, the blue screen flashing does not happen at all.
So, what could be causing this problem, and how do i fix it?

Hi Matt,
See if there's some setting on the HDMI monitor for Input Source, or things like Auto-tune.

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   2. Type: in Terminal the command
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   3. Press Return.
   4. Type (in Terminal, note space before mv)
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   6. Type:
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   7. Press Return.
   8. Type: reboot
   9. Press Return.
Then I followed up with this tip to "Reset certain privileges"
1. Start up the computer in Single-User Mode.
   2. Check the volume with fsck.
   3. Type: mount -uw /
   4. Press Return.
   5. Type: chmod 1775 /
   6. Press Return.
   7. Type: reboot
   8. Press Return.
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I am not sure what 1775 means, but this fix got my computer back up, saving me at least a $150 bill at the Genius Bar.
When I typed those commands into Terminal, this is what returned, and seems to be some QXPscrpiting issue, though I have no idea what that is. and again, some Dropbox issues. If anyone has any idea what all those issues are regarding ScriptingCodes please let me know.
My-Mac-mini:~ username$ /System/Library/CoreServices/Finder.app/Contents/MacOSFinder &
[1] 892
Rangdrols-Mac-mini:~ username$ -bash: /System/Library/CoreServices/Finder.app/Contents/MacOSFinder: No such file or directory
[1]+ Exit 127                /System/Library/CoreServices/Finder.app/Contents/MacOSFinder
My-Mac-mini:~ username$
Rangdrols-Mac-mini:~ username$ /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder & disown
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Finder: OpenScripting.framework - scripting addition "/Library/ScriptingAdditions/QXPScriptingAdditions.osax" declares no loadable handlers.
Dropbox: Entered INJECT_pthread_entry
Dropbox: Installing event loop timer
Dropbox: proc: 0x11d171e53
Dropbox: upp: 0x11d171e53
Dropbox: InstallEventLoopTimer: 0x101341dd8
Dropbox: GetMainEventLoop: 0x101341c41
Dropbox: timer installed!
Dropbox: Loading /Library/DropboxHelperTools/Dropbox_u501/DropboxBundle.bundle/Contents/MacOS/Dr opboxBundle
Dropbox: dlopen returned: 0x11bb12090
module initializer in main thread?: 1

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And, before the mount -uw you really should've done this...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
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