Apple - Big black vertical bar on external screen

My monitor shows exactly the same black sidebar on the left. Tried many tips and tricks. And finally unplug the miniDP to VGA connecter on both side and reconnect again solve the problem.

I tried to change the VGA side here and there for hours. :( so stupid me. So I guess some other also had the same experiences but I don't know why the answer is marked down to negative scores...

I didn't mean to solve all the problem for all. But just a mark for myself that shows it solved my problem and hopefully will help some of the others.

Try this:

• Go into Displays Preferences > Check Mark the box for "Show displays in menu bar"

• Under the resulting icon in the menu bar, drop the menu and set "Number of recent items" to 10.

• Click the menu again and you should see a list of recently used timings/formats. Multiple 1920 x 1080 might appear, switch to one or the other and it might just fix your issue.

Also:

In Displays Preferences > Displays > “Options” tab/button near the top of the window and make sure the “overscan” box is checked.

It would be helpful to know if you're trying to run 1080i or 1080p, and what model of your external display is.

Find out what the native resolution of the external monitor is and configure the Mac to output that exact resolution (and 60Hz refresh).

If you're using an analogue signal (VGA, often a blue plug), push the auto adjustment button on the external monitor afterwards.

If that doesn't fix it, reset the monitor's settings (in the on-screen menu of the monitor) to the default.

Edit: Still not fixed? Swap out the monitor cable and the Mac's mini-displayport adapter.

Edit 2: Also, get a new wallet.