It is always a good idea to test the computer monitor from time to time, especially after installing new video card drivers, operating systems or purchase a new one. Monitor Test is actually a name of an application that can aid the user in testing a computer monitor.
It was mentioned at the New Morning site [...]

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It can happen that your new LCD monitor is having dead or stuck pixels which can be rather unfortunate depending on the location of the pixels and the laws of the country you bought the monitor in. Some dead pixels on a newly bought monitor may not be enough to return it.
It can also happen [...]

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