DIAGNOSIS Total power failure. The first suspect is the internal thermal fuse, which can blow if there was a voltage spike or the unit seriously overheated.
FIX Check the obvious first. Try a different, known-working wall outlet. Ensure the power cord is fully plugged into the back of the air fryer—that connection can be surprisingly stiff and might not be all the way in.
IF THAT DIDN'T WORK There's no user-resettable fuse. A dead display with no signs of life points to that internal fuse or the main control board. This isn't a fix-it-yourself scenario. You'll need to contact Gourmia support for warranty service or a replacement.
HEADS UP These have a safety feature where they won't power on if the basket isn't fully seated. Push the basket firmly into the unit until you feel it click. But if the display is *truly* blank, that's not the issue here.