One idea is trying it on someones TV that you know is working with WiFi.
Another is plugging it into your PC via USB (only) open File Explorer and see what's in there. (Be careful - don't reformat it or delete things from it).
I'm leaving a link on Trouble shooting Firestick & Fire TV, It talks about a blank screen in there.
Fire TV is Frozen Blank or Wont Power On
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