DIAGNOSIS The unit isn't getting power. This is almost always a simple connection issue, not a fried control board.
FIX Let's trace the power path. 1) Check that the outlet works by plugging in something else, like a lamp. 2) Ensure the power cord is fully pushed into the socket on the back of the fryer—it can look connected but not be. 3) Try a different, known-good outlet on a different circuit. Avoid using an extension cord or power strip for this test.
IF THAT DIDN'T WORK There's a chance the internal thermal fuse has blown, often from a previous overheating event. This requires opening the unit, which voids the warranty. Your best move here is to contact Instant Brands support—they're pretty good about helping with these kinds of failures.
HEADS UP Never submerge the main unit in water or spray cleaner directly on the display or controls. Wipe with a damp cloth only. Liquid damage can cause this blank screen issue.