display interview questions

Top display frequently asked interview questions

How can I view a list of all monitors connected in the past?

I'm usually connecting my laptop to a larger screen. I'm away from my desk for a few days and I'd like to know what model of monitor that is. I just remember the manufacturer, size and and native resolution. I know that Windows remembers previously connected monitors and their settings. Does it also remember more details about them, like monitor model?

Can I view a list of monitors that were connected to a computer in the past? I'm using Windows 10.

Source: (StackOverflow)

Turn off display in Windows on command

Is there a way to turn off the display in Windows (7), preferably without using additional software?

Powershell script works fine, but leaves command-line window after turning on the display.

Source: (StackOverflow)

Connecting 2 External Monitors to a Laptop?

Equaling 3 Displays Total (or 2, if the laptop display cannot be used).

I work at home on two large monitors, but at the office on a laptop with a single large monitor. Is it possible to attach two (or more?) external monitors to a laptop without having them clone each-others display?

Source: (StackOverflow)

Why don't websites immediately display their text these days?

I've noticed that recently many websites are slow to display their text. Usually, the background, images and so on are going to be loaded, but no text. After some time the text starts appearing here and there (not always all of it at the same time).

It basically works the opposite as it used to, when the text was displayed first, then the images and the rest was loading afterwards. What new technology is creating this issue? Any idea?

Note that I'm on a slow connection, which probably accentuates the problem.

See below for an example - everything's loaded but it takes a few more seconds before the text is finally displayed:

enter image description here

Source: (StackOverflow)

How can I dim my computer screen beyond the minimum?

I usually just use Fn + Left or Fn + Right to adjust my screen's brightness but the minimum settings are still too bright for me (especially when I'm working at night). I tried going through the Power Options in the Control Panel (plan brightness already at the lowest settings). Is there a way to dim my laptop's screen beyond the minimum?

I'm already using Fl.ux. I was wondering if there was a utility similar to it that adjusts my screen's brightness/contrast instead of its color temperature.

Source: (StackOverflow)

What is the best way to clean an LCD monitor?

I have loads of grubby finger marks on my monitor (mine and smaller people's). I'm not sure how to clean them off without damaging the monitor.

What's the best way to safely clean dust, smudges and fingerprints off an LCD?

Source: (StackOverflow)

What's the correct monitor height for large monitors?

Conventional ergonomics guides suggest aligning the top of the monitor to where the operator looks at straight on. It seems doubtful that that still applies to today's 24" and 30" and larger displays.

What was the reasoning behind that rule? What's the correct way to position a huge display according to current research?

Would anyone have a reference to research confirming the "2/3 up" rule?

Source: (StackOverflow)

Displaying XML in the Chrome browser

I love the Chrome browser, but I use XML quite a lot in my development work and when I view it in Chrome I just get the rendered text.

I know that the source view is slightly better, but I'd really like to see the layout and functionality that Internet Explorer adds to XML, namely:

  • Highlighting
  • Open/close nodes

Any ideas how I can get this on Chrome?


The XMLTree Extension is available on Google Chrome Extension Beta Site.

Source: (StackOverflow)

What did computers use for output before monitors?

How did the early industrial computers, such as UNIVAC, ENIAC, MARK I, etc display output before monitors existed?

Did the first personal computers, like the Altair 8800 or the Simon use monitors, or did they use some alternate output as well?

Source: (StackOverflow)

Turning DisplayPort monitor off disables monitor completely

I have 2 monitors connected to a NVIDIA GeForce GTX 660:

  • Left is 1920x1080 via DVI (Samsung SyncMaster 2443BW)
  • Right is 2560x1440 via DisplayPort and is set to Primary (Samsung SyncMaster SA850)

I often leave my computer running overnight (working on long render job, doing backups, etc) so I only power off my monitors manually. However, if I power off the primary monitor, it is disabled completely as if it were unplugged from the graphics card (i.e. icons are moved, open apps are moved and resized to fit on the new primary monitor). If I switch from DP to a DVI cable, this does not occur. It seems to be an issue when using DisplayPort.

Is there a way to disable the monitor from being disabled completely in Windows when I power it off physically?

I have found no relevant settings in either Windows Display settings, nor the NVIDIA control panel software.

Edit #1: I'm using an Oehlbach Transdata DP 510 cable.

Edit #2: Here is a screenshot of my NVIDIA Control Panel v7.2.710.0: enter image description here

Edit #3: Here are screenshots of my Monitor configuration:

enter image description here

Clicking on Advanced settings reveals a Generic PnP monitor running at 59 Hz? 60 Hz is the only other option available.

enter image description here

Here is my secondary monitor which is connected via DVI:

enter image description here

Edit #4: If I open the "Screen Resolution" configuration panel and power the monitor off (via the power switch), this is what is shown:

enter image description here

It looks like I disconnected the monitor from the video card.

Source: (StackOverflow)

Can I sleep one of the displays on a multi-monitor setup?

I want to be able to 'put the display to sleep' on one of my two monitors when it isn't needed, so it doesn't distract me or use unnecessary power.

Ideally, the display would be asleep, but the OS would remain in dual-monitor mode, so I could still have a variety of windows open in the sleeping monitor's display space, which would mean I wouldn't have to keep switching between single- and dual-monitor modes.

That said, I'd also consider a solution that made it easy to toggle between single- and dual-monitor modes without navigating several system menus.

Source: (StackOverflow)

How can I display the Windows 8 Start Screen on a secondary monitor?

Is there a way to get Windows 8 to use my secondary monitor for the start screen?

Source: (StackOverflow)

Is an LED monitor better for eyes than an LCD monitor?

Is an LED monitor better for eyes than an LCD monitor?

EDIT: And if you are allergic to fluorescent light, is LED going to be better? I heard that LED doesn't uses fluorescent light.

Source: (StackOverflow)

Is VGA port hot-pluggable?

In meetings, I often see people detaching the VGA connector from one running laptop and connecting it to another, while the projector is still on.

Is this 100% risk free, and OK by design of the VGA standard? If there's a risk involved in hot-plugging VGA, can it be removed by turning off or suspending either laptop, display, or both?

I see this being done all the time without causing disaster, so clearly I'm not interested in answers stating "we do it all the time, so it should be OK!".

I want to know if there's a risk - real or in theory - that something breaks when doing this.

EDIT: I did an internet search on the topic, and I never found a clear statement as to why it is safe or unsafe to hot swap VGA devices. The typical form is a forum question asking basically the same question as I did, and the following types of statements

  • Yes it's hot swappable! I do it all the time!
  • It involves some kind of risk, so don't do it!
  • You're some kind of moron if you think there's a risk, so just do it!

But no explanation as to why it safe or not...

Joe Taylors answer below contains a link to a forum post and answers that basically give me the same statements as mentioned above. But again, no good explanation why.

So I looked for an actual manual for a projector, and found "Lenovo C500 Projector User’s Guide". It states on page 3-1:

Connecting devices

Computers and video devices can be connected to the projector at the same time. Check the user’s manual of the connecting device to confirm that it has the appropriate output connector.


Attention: As a safety precaution, disconnect all power to the projector and devices before making connections.

But again, no good explanation.

Source: (StackOverflow)

How to use different scaling for every monitor?

One of the new features in Windows 8.1 is the new "Desktop display scaling", which allows user to configure scaling per monitor. I've been trying to get this working in preview but with no success. If I configure the scaling, it always affects all of my monitors.

I have two monitors, the main one with a higher resolution and the secondary with "normal" resolution. The secondary monitor is used in portrait mode. I would like to configure the main monitor's scaling as the text is currently too small.

Here's how things look at the configuration screen by default:

Default scaling

Now if I adjust the scaling, click apply and do relogin, everything is bigger. On both of my monitors. I haven't clicked the "Let me choose one scaling level for all my displays", but still the slider seems to affect both of them.

If I check the "Let me choose one scaling level", the UI changes to look similar to what we have in Windows 8:

Checkbox enabled

Still the problem persists. The scaling is applied to both of my monitors. So, it doesn't matter if I check the box or not, the scaling is always applied to all the displays.

Any idea how I could get this to work in Windows 8.1? I've read some comments which seem to indicate that this should work, though Paul Thurrott mentioned at his Winsupersite article that he either didn't get this to work.

Source: (StackOverflow)