Is this the newspaper?
Sounds silly, but so does asking a question on the internet without providing all the information.
What appliance; TV? What year and model? What have you done to correct the fault? Has this happened before? Have you searched the internet for an answer, or hope others will do it for you?
Suddenly today my Netflix app doesn't work. I click on the icon and all I get is a blank screen. I checked Netflix on my other Samsung TV and roku and they work. Can any one help me out?

Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic