The display on a Mac Pro 5,1 is blacking out for a second or two at times that seem random. I am hoping you will be able to help me fix this problem.
BACKROUND
I read that replacing the stock Radeon 5770 with AMD r9 280X would suffice as a graphics card in a Mac Pro 5,1 upgrading to Mojave. With a Mac-Flashed edition of that card, the upgrade has come off without incident.
However, I have had problems with a Samsung U28d590 4K monitor connected to that card via displayport. Regardless of the screen resolution selected, the monitor goes black for a second or two.
This problem first appeared about a month before the stock Radeon 5770 was replaced, A brief visit with Google search combined with moving the displayport cable from one of the ports to the other solved the problem. Temporarily.
When the replacement card went into cheese grater, filling the slot made vacant by the departure of the Radeon 5770, the 1-2 second screen blackouts came back. At first, it seemed the obvious culprit is the "new" used video card, but that theory was undercut by a few considerations and then an experiment with a surprising result.
It's Not Necessarily the Graphics Card, Stupid.
Short screen blackouts happen on all kinds of computers for all kinds of reasons. A half hour visit to Google search on this topic will show you what I mean.
Unexpected Result of Experiment
Two mini displayport ports on the new video card means two monitors can be hooked up to the same card. I have two monitors, on my desk now. I expected when the Samsung monitor went dark, the other monitor would too, thus removing from the monitor from the list of suspected culprits. Here is what happened:
Unexected result 1: When the Samsung monitor went black for a second, the other monitor, (Asus 287 HD monitor) stayed lit. It never goes black.
Unexpected result 2: The frequency of black outs on the Samsung monitor fell from once every minute to a couple times all day.
BACKROUND
I read that replacing the stock Radeon 5770 with AMD r9 280X would suffice as a graphics card in a Mac Pro 5,1 upgrading to Mojave. With a Mac-Flashed edition of that card, the upgrade has come off without incident.
However, I have had problems with a Samsung U28d590 4K monitor connected to that card via displayport. Regardless of the screen resolution selected, the monitor goes black for a second or two.
This problem first appeared about a month before the stock Radeon 5770 was replaced, A brief visit with Google search combined with moving the displayport cable from one of the ports to the other solved the problem. Temporarily.
When the replacement card went into cheese grater, filling the slot made vacant by the departure of the Radeon 5770, the 1-2 second screen blackouts came back. At first, it seemed the obvious culprit is the "new" used video card, but that theory was undercut by a few considerations and then an experiment with a surprising result.
It's Not Necessarily the Graphics Card, Stupid.
Short screen blackouts happen on all kinds of computers for all kinds of reasons. A half hour visit to Google search on this topic will show you what I mean.
Unexpected Result of Experiment
Two mini displayport ports on the new video card means two monitors can be hooked up to the same card. I have two monitors, on my desk now. I expected when the Samsung monitor went dark, the other monitor would too, thus removing from the monitor from the list of suspected culprits. Here is what happened:
Unexected result 1: When the Samsung monitor went black for a second, the other monitor, (Asus 287 HD monitor) stayed lit. It never goes black.
Unexpected result 2: The frequency of black outs on the Samsung monitor fell from once every minute to a couple times all day.
