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There have been several threads concerning the R9 3xx series GPU card not working after crashing and restarting or updating.
problems with R9 390 ( This give tips on how to get your GPU card to be recognized by another User).
See if your card will work again with a previous AMD Driver installed. If not, see if your GPU Card works and is recognized in another computer.
Downgrading to 18.2.3 fixed this. Thanks!