I never wrote a program so quickly. It took just 10 minutes! And it does exactly what it shoud.
Screentest helps to find pixel errors on flatscreens. It colors the whole screen(s) with one single color (which can easiely be adjusted) and makes hidden pixel errors this way visible.
The program was needed for me to write a report for an assurance.
It costs nothing and works. Simply download and start it.
If you prefer to download a zip-file, no problem. It is here. Unpack in a folder of your choice and enjoy!