fixed : Benq monitor stays black when MacBook is switched on

Question :

I have a Benq BL2420PT external monitor as a desktop screen connected to my MacBook using a Displayport-cable (actually a miniDisplayport-to-Displayport-cable). When my MacBook goes into sleep mode or the Ben monitor goes into sleep mode itself the screen goes black. But when I try to revive the monitor by moving my external mouse or pressing any key on my (external) keyboard, the MacBook starts up, but the Ben monitor’s screen stays black.

This same thing sometimes happens when I startup my MacBook and close the lid before the Benq monitor switches on.

What can I do to fix this ?

 

Answer :

The following trick might help for other Benq monitors, and maybe even for different brands of monitors also. This works for the Benq BL2420PT monitor if the screen stays black even when the connected Mac is turned on :

  • on the frame of the screen, bottom right, you see 5 indicator lights, next to the Power-indicator ; these are all touch-buttons
  • if the Power-indicator/button is steadily glowing in white, don’t touch it ; only if it has another color, touch it to switch on the monitor
  • if the Power-indicator still doesn’t glow white, check if all cables are connected properly and make sure the physical ON/OFF-switch on the bottom of the screen is switched ON
  • touch the one indicator light/button that is nearest to the centre of the screen (so the most left one)
  • if a message appears “No cable connected”, just wait
  • if a menu appears with 5 cable connectors to choose from, don’t touch anything, just wait
  • just wait (usually up to 30 seconds, sometimes even a minute) and the screen will switch on

NOTE : the most important thing is that you DO NOT¬†(neither accidentally nor intentionally) touch any other indicator/button ! as this usually screws up the monitor’s software setting that corresponds to the physical cable connection (to correct that, you should toggle around with the these touch-buttons until the menu with the 5 cable connectors reappears and you can then choose the one that corresponds to your physically connected cable)

If the above doesn’t work, look here for alternate procedures to revive your black screen :

fixed : MacBook’s external monitor screen stays black

That’s it !

enjoy ūüėČ

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fixed : MacBook’s external monitor screen stays black

Question :

In my office, I am using an external monitor as my main screen for my MacBook Pro.¬†Today, the screen didn’t respond when I connected my MacBook however :¬†the screen stays black and nothing appears on-screen.¬†So I opened up my MacBook and used the built-in screen to figure out what’s wrong, but so far I haven’t¬†found any indication in the Displays¬†Preference Panel that my MacBook even detects the second screen…

What can I do ?

 

Answer :

In such situations you should always do this first :

Remedy #1 :

  • make sure your monitor is switched ON
  • then hit the SPACE-bar on your external keyboard several times (maybe once, usually about 5 to 10 times…)
  • the monitor should now appear and show the inlog panel to unlock your screensaver
  • then login

if this works, you’re good, if not, try Remedy #2

NOTE : if you have a Benq monitor (especially the BL2420TP), try this first :

fixed : Benq monitor stays black when MacBook is switched on

Remedy #2 :

  • unplug all cables between the monitor and your Mac ( DisplayPort / Thunderbolt / HDMI / DVI / VGA ¬†and also USB, UTP, FireWire and PowerAdapter )
  • shut down your monitor
  • shut down¬†your MacBook
  • reconnect all cables and double-check if they’re properly connected on both the Mac and the monitor
  • switch on your MacBook
  • switch on your monitor

if this works, you’re good, if not, try Remedy #3

Remedy #3 :

  • on your MacBook, open Apple [main menu bar top-left] –> System Preferences
  • in the System Preferences window, select “Displays”
  • in the Display Preferences window, see if there is a button marked “Gather Windows” bottom right
  • if there is no “Gather Windows” button, press the ALT-key on your keyboard and a button marked “Detect Displays” appears ; click on it when it appears

if this works, you’re good, if not, try Remedy #4

Remedy #4 :

  • on your MacBook, open Apple [main menu bar top-left] –> System Preferences
  • in the System Preferences window, select “Displays”
  • in the Display Preferences window, see if there is a button marked “Gather Windows” bottom right
  • if there is a¬†“Gather Windows” button, click on it
  • then you will see 2 Display Preference windows on your MacBook screen
  • select the Display Preference window that has 3 tabs on it marked “Display”, “Arrangement” and “Color” (not the window¬†that has “Display” and “Color” only)
  • first, press the ALT-key on your keyboard and a button marked “Detect Displays” appears¬†where the “Gather Windows”-button used to be ; click on it when it appears
  • if your monitor switches on, you’re good, if not…
  • click on the “Arrangement”-tab and in the next window put a checkmark at “Mirror Display”
  • if your monitor switches on now, uncheck the “Mirror Display” option again and close your MacBook… you should be good now…

if this didn’t work, try Remedy #5

Remedy #5 :

  • unplug all cables between the monitor and your Mac ( DisplayPort / Thunderbolt / HDMI / DVI / VGA ¬†and also USB, UTP, FireWire and PowerAdapter )
  • shut down your monitor
  • shut down¬†your MacBook
  • reconnect your Mac to your monitor using a different type of cable then you normally would choose (e.g. if you normally use a DisplayPort/Thunderbolt-cable, use an HDMI or DVI cable now)
  • switch on your MacBook
  • switch on your monitor
  • if your monitor wakes from sleep now, open Apple –> System Preferences
  • in the System Preferences window, select “Displays”
  • in the Display Preferences window, see if there is a button marked “Gather Windows” bottom right
  • if there is¬†a¬†“Gather Windows” button, click on it
  • then you will see 2 Display Preference windows on your MacBook screen
  • now, remove the monitor-cable that you have just used to connect your MacBook to your monitor
  • then, reconnect your MacBook to your monitor using all cables you normally use to connect the two
  • if your monitor now wakes from sleep, you’re good
  • if it doesn’t, restart your monitor
  • it that doesn’t help, restart your Mac

normally your issue should be resolved by now…

if still the monitor stays showing a back screen, I’m sorry to inform you that your screen probably has a hardware problem… if so, get an authorized Mac-repair-centre to fix it, get the Apple Store support-crew to fix this…

that’s it !

enjoy ūüėČ

fixed : black screen when trying to take a photo in iOS

Question :

Lately, whenever I try to take a photo with my iPhone, all I get is a black screen.

I am using the pre-installed Camera-app in iOS.

How can I get this fixed ?

 

Answer :

There are two known software causes for this ‘black screen’-issue (so apart from hardware problems like broken iPhones) :

solution  #1 :

If you have just used your camera in another app (e.g. WhatsApp) and you then switched to the ¬†standard iOS Camera.app, you might run into a black screen because the camera is still being claimed by the previous app…

The fix for this is easy : close down the iOS Camera.app and the other app that was using your camera, then re-open the iOS Camera.app ; to do so :

  1. double-clicking on the Menu-button below the screen (in the next view you’ll be able to browse through windows of all open apps)
  2. close all apps that are using your iPhone’s camera (by swiping the windows of those apps you want to close upward)
  3. then return to normal view by clicking the Menu-button once
  4. and when done, re-open the iOS Camera-app

solution #2 :

The black screen issue in Camera.app has been reported as a bug in earlier versions of iOS 9, so fixing it is simply done by updating your iPhone to the latest version of iOS 9 (or iOS 10).

To do so :

  1. on your iPhone, go to Settings –> General –> Software Update
  2. you will most likely see that you don’t have the latest version of iOS
  3. activate the update to the latest version of iOS

…that’s it ūüėČ

enjoy !

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