More MacPro6,1 Multi-Display Woes

I have 3 older Dell 24" monitors (2 2408WFP's and 1 ST2420L) attached to my 2013 Mac Pro via 1 mDP to active dual-link DVI and 2 mDP to single link DVI adapters. The monitors function flawlessly - until the system puts them to sleep. Each time it wakes, I have to reconfigure the display arrangement including which display is the "main". I have tried many different combinations (I won't say "all" but I bet that I have) of which monitor uses the dual-link adapter and which get the single links and to which ports they are attached on the machine. It makes no difference. And the arrangement and main display that is chosen when it comes back from monitor sleep appears to be quite random. (It occasionaly gets it right, but not very often.)
I perused the discussion board and haven't seen this topic (at least in recent titles). Are others experiencing this behavior or is it something peculiar to my setup?
Thanks,
Cliff

Dell 2408WFP
Video Inputs
2 x DVI with HDCP support
HDMI
DisplayPort
Analog (VGA)
Component
S-Video
Composite
Buy yourself two cheap Mini DisplayPort to DisplayPort cables (under US$10 each). They have No electronics, just wires.
Make sure you have one display to a ThunderBolt port for best performance:
Mac Pro (Late 2013): Using multiple displays

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I suspect that there may be more that went wrong than just your display. I am going to recommend that you do a backup and full factory recovery of your computer. This will fix your restore feature as well as the tools partition that is also not working. To backup your personal information and ensure that it is not lost I would like you to review and follow the steps set out in the HP Support document: Backing Up Your Files (Windows 8), which will ensure your personal files are up to date.
***WARNING!! If you want to keep any emails or bookmarks/favorites you will want to back those up as well as I do not believe they are backed up in the HP Backup process.
Next, I would like you to review and follow the steps set out in the HP Support document: Performing an HP System Recovery (Windows 8), which will you through recovering your computer back to factory settings.
*** IMPORTANT - Your personal files such as libraries, personalization settings, user accounts, and desktop themes are permanently removed. As well the computer settings are returned to the defaults (the way it was when it came from the factory). All apps and software that were installed on the computer when it came from the factory are reinstalled, and their settings are reset to the defaults. Additionally, software, apps, programs, and everything that you have installed or saved on the computer are permanently removed.
I would like to thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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