E223 displays only detect input signal when using a dedicated (desktop) graphics card

[Boulliebeest]

As I mentioned in my previous post, this was already tested, and other screens all behave as expected.

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@itsmyname wrote:

@Boulliebeest -- do you have (or can you borrow) a completely-different screen with either HDMI or DisplayPort input, to repeat those "red" tests?  Remember to tell the screen to try "listening" to each of its available video-input sources.

During each test, on each of the computers, hold-down the "Windows" key on the keyboard, and tap the "P" key, to see whether Windows detects more than one graphics-adapter.

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[itsmyname]

@Boulliebeest -- I reread all the postings to this thread, and it seems like the monitor is the problem. You did state that Windows does recognize that the monitor is connected. So, "plug-and-play" is working, within Windows.

How much time & effort do you want to invest in any further investigation, versus purchasing a different monitor, and repurposing the Dell monitor -- connecting it to a computer where it works as it should?

Does the monitor still have a valid warranty?  If so, is it worth your time to exercise the warranty, to get it repaired/replaced?

[Boulliebeest]

There is no warranty on the displays anymore, and we already opted to replace them both.

However, as stated in my initial post, I would like to know what is causing this weird behavior, as it defies all logic...

[itsmyname]

@Boulliebeest --  I would like to know what is causing this weird behavior, as it defies all logic.

Does it really defy all logic ?   Logically, it is clear that there is something "special" about the monitor.

You have done all the "logical" tests to isolate the problem to this one monitor.

Since you now say that you have bypassed the monitor, there is less urgency to find a solution to the electronics and firmware inside the monitor.

I think that I will "bow out" of this thread, because there is nothing more that I can contribute.

One final question: do you have more than one of these monitors? Do all of them have the same issue?

As a teenager, many years ago, when shopping for a hockey-stick, I snapped a few sticks in half, in the sporting-goods store, by simply leaning on them, to test their flex. Other sticks from the same store lasted for a long time. So, not all sticks are the same, even though they looked to be identical. Maybe, the same applies for monitors.

[Boulliebeest]

We have multiples, yes.

And the situation explained has happened with 2 of them so far.