Windows 10: Asus laptop will not detect an older Dell monitor connected to HDMI port

I have an older Dell Monitor connected to an Asus TP550LA laptop and it's not detecting the external display.

:)

 

Dell Inspiron 13 7000 2-in-1 Windows 10 laptop HDMI port can not detect my monitors

I purchased a Dell Inspiron 13 7000 2-in1 laptop three months ago. Today the HDMI port can no longer detect my external monitor.

 

Swap display port and HDMI port ourputs on Windows 10, Dell XPS 8920

Just purchased a new Dell XPS 8920 with Windows 10 that has both a Display port and HDMI port. My new monitor has the HDMI port and my older smaller monitor uses the computers Display port with a conversion cable to DVI on the monitor. How can I swap
monitor 1 (older) with monitor 2 (newer)? Windows lets me move the screens right and left but not swap primary #1 and secondary #2. Thanks for any suggestions; Capt. Brigg

 

Windows cannot detect monitor resolution. No EDID detected


I bought LG 23MP67HQ as my second monitor because it has HDMI input.
Tested OK and well at the shop.
It has two display input, VGA and HDMI.
My first monitor has VGA and DVI port.
My graphics card is ASUS STRIX GTX960. Which has three display ports, One HDMI and one DVI.

The problem is windows couldn't detect the correct EDID thus using non-native display (1024x768) when connected using HDMI. Correct EDID were detected only when using display with VGA connector.

So, I begin troubleshooting.

1. Changing the HDMI cable ... same problem.
2. Connecting using my laptop (MacBook Air) ... same problem (and flickers).
3. Checking my laptop and PC by connecting it to the TV using HDMI ... no problem, works fine.
4. Connecting to the monitor using HDMI as the only monitor to my PC ... same problem.
5. Connecting to the monitor using VGA as the only monitor to my PC ... no problem, works fine.
6. Connecting to the monitor using VGA as the second monitor to my laptop... no problem, works fine.
7. Go to the shop and tested the display using HDMI ... no problem, works fine. (WTF)

So, what is the problem?