Troubleshoot LCD monitor with "No video input" and "Sleeping Mode" simple and cheap

Because I recently had an issue where the LCD monitor I was occasionally working on was no longer working, only displaying the message in Sleeping Mode "No video input". 

How did I solve the "No video input" problem and how was the monitor repaired?

Men’s watches: the best 2020 buying guide?

Men's watches: Maybe the best 2020 buying guide!

Men’s watches: the best 2020 buying guide?