XPS L502X HDMI: No Signal

Hi all,

I am trying to use my Laptop with an ACER 272HUL Monitor via HDMI cable.

Situation:

Whenever I plug in the HDMI cable, the Monitor Model (Acer K272HUL) and the correct max resolution (2560x1440) is being shown on screen of the Laptop (Screen resolution window).

Also, when selectimng the HDMI port I use on the monitor, the monitor does NOT say "no cable connected" which it does at all the other ports. So, seems that the principle connection between the Laptop and the Monitor works, but no signal is sent ... ???

After a little while, the monitor also says "No signal".

Now, I found on the web that the max. resolution of that monitor on HDMI seems to be 1920 x 1080 @60 Hertz, so I changed the resolution to that values but with no luck. Also reducing the repeat rate to 50Hz (by going to "advanced" and select it from the "mode" Button) does not help - monitor stays black.

Any help?