Screen flickering is the most annoying issue that causes utter distress in computing. This commonly happens after a prolonged usage of a monitor or due to internal damages. Computer support professionals, especially those who provide remote support to their customers are all set to come up with instant resolutions for such issues. Flickering or sudden discolorations are the most obvious sign of permanent wear outs and so the users need to replace that with a shiny new one.
However in some cases the problem can also arise from the internal system setups. Other than fault in power supply, as suggested by the computer support professionals, some other essential components also significantly contribute to the mal function of your computer monitor like motherboard, sound card or main circuit. So, it is rather wise to consult an experienced tech support professional before buying a new one.