Third monitor does not work with Eyefinity more

I am trying to run 3 monitors on my ATI HD 5770

I have two computers that, for years, have worked with several thin monitors... until very recently.  Through all my updates to the OS, they continued to work.  I don't remember exactly at what time each card has ceased to power its third monitor.  Each of my "third monitors" would come on periodically until they all finally stopped.

All monitors are working fine as I juggle the cables and adapters each refreshes and lights up but not all at the same time.

Here's what I have available for troubleshooting.

I have two Mac Pros below.  (OS 10.11.6) on one and (OS 10.7.5) on the other.

Each tower has (2) 5770 cards installed that each have a DVI and 2 mini ports.

So I have a total of (4) cards and is starting the new one that I got on ebay last week.

I have LG E2350V 23 "monitors (6) and (3) 22" ACER monitors

All my cables are active and I have several active adapters

I just bought some passive extra and many very active adapters to the experience and trouble shooting with.

Thanks in advance for the help and time!

DisplayPort and its variant electrically identical but small size Mini DisplayPort and the implementation which is a subset of Thunderbolt, any differential use (push-pull) of signals pilot very low voltage. They are MORE immune to noise than old methods because the signal is encoded on the difference between the two signals, not a single signal referenced to a "everybody" on the ground. If possible, you must connect all screens with DisplayPort [full-size] or Mini DisplayPort. These put a lot less load on your system.

When you convert this very low level signal to an "inherited" display, the map is short of ability to directly signal levels in the car high enough to be recognized after connection of TWO monitors legacy of any kind. If you choose to use a DVI or HDMI port supplied directly, that still counts as one of your two "free" conversions (It is also possible that a very fussy display is moved even earlier).

All display "legacy" beyond the first two requires ACTIVE description adapters. Adapters ASSETS contain re-drivers of signal and are therefore more expensive than ordinary adapters. Typical prices are of the order of $ 40, but competition has lowered some prices slightly. Mini DisplayPort has a descendant-comparability mode requested by the regular cards, who can get to produce a Single-Link DVI signal to up to 1920 wide, but a regular adapter not pushed the signal levels.

The Apple Mini DisplayPort to DVI Dual-Link, which is used for DVI displays wider width of 1920, is more complex and expensive and requires extra power beyond all signal re-pilots. This power is usually taken on a tail of pig USB, USB data are generally not used by the adapter, so a different USB power source can be overridden.

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