U2414H, screen flickering constantly

Reply to the private message from DELL-Cares with the private Service Tag number. If the U2414H does not have a Service Tag number, provide to them the 20 digit serial number.

The video shows it connected to the PC. We need to see a video of the monitor when NOT connected to any video cable and running the stand alone Built-in Diagnostics, page 58.

Here are a few more videos when not connected to any video cable and running the Bulit-in Diagnostics:

https://drive.google.com/drive/folders/1EivP4M549cN-3eajVBoiM8HJOL_hDz0b?usp=sharing 

@pepe_sc  Not trying to defend Dell here as I am a customer like you. 

But ensure to maximum warranty possible of whichever brand you go for

I am sys admin for my company and purchase items in bulk. For premium monitors (above 300$) I always go with 3 year warranty. 

"The same happens with pc cable unplugged. Tried with a different power cable, but no change. Factory reset did nothing." 

This is where troubleshooting ends, you have done everything you could. Dell doesn't have a firmware update for this model. I hope that your Monitor is in warranty. Some monitors come with a year and some with 3 years advanced exchange. 

if you have a service tag you may check the warranty at Product Support | Dell US

If you don't have a service tag, check your invoice or order details at Order Support | Dell US

In your order line items one of the items should have an Advance exchange 3 years. 

If no warranty yes you need a new monitor. 

Hello,

I have responded to private message and provided additional videos.

Any further feedback, pls ?

I am quite annoyed that DELL monitor lasted only 4 years, not to mention that a vertical line appeared on the screen just after warranty period ended... Looks like a have to get a new monitor again...  

OK, thanks @XPS_Man .

I need a new monitor then, don't think it will be DELL...