Macbook Pro 13" mid 2012 doesn't connect to external displays

[Khaleal]

My Macbook Pro 13" (mid 2012 non-Retina) won't connect to any of my external displays.

Macbook Pro specs: i5 16GB RAM 250GB SSD

Displays:
Dell S2415H (HDMI input)
Samsung S24F350FHM (VGA input)

Tried two different adapters: Mini-DP to VGA, Mini-DP to HDMI. Both don't work.
In System Information, Thunderbolt hardware is present but it says "no device connected" although it's connected to the display.

What I've tried so far:

1. SMC reset
2. NVRAM reset
3. Re-installed High Sierra
4. Downgraded to Sierra

But nothing seems to work. Any ideas?

 

[treekram]

The screenshot says you have a MacBook Air. Is that an error?

In any case, the Thunderbolt 1/2 ports on Macs put out either a DisplayPort or Thunderbolt signal depending on the device that's connected. If you don't have a Thunderbolt device, it won't show up in the Thunderbolt pane in your screenshot. Neither of your monitors are Thunderbolt monitors. You should instead look at the Graphics/Displays pane to see if it shows up there. Have you looked in System Preferences to see if the external displays show up there? Connecting the monitors you have should be straightforward and it's hard to believe that two sets of adapters/cables aren't working - if they're not appearing in the two places I suggested, you may want to make an appointment at an Apple Genius Bar to see what's going on with your computer.

 

[Khaleal]

The screenshot says you have a MacBook Air. Is that an error?

That's a screenshot I got from the internet. But mine looks exactly the same. Both displays don't show up in Graphics/Displays pane and/or System Preferences.
Unfortunately, we don't have an Apple store in my country. There is an ASP but they don't work on out of warranty devices

 

[treekram]

In System Preferences, when selecting the "Displays" option, if there is "Detect Displays" button, try pressing that. If the button doesn't appear, press and hold down the Option key and it should appear.

If that doesn't work, you can try going through the steps in the following Apple document (under "If the display image is blank or unusuable"):
https://support.apple.com/en-us/HT201177

If none of these work, then you have to go through a process of elimination - can the monitors work with another computer with the same cables/adapters? Does the MBP work with any other monitor?