DIAGNOSIS A totally dead unit usually points to a power supply issue, not a complex internal failure. The most common culprit is the thermal fuse on the bottom of the pot blowing, often from overheating if the pot was run without the inner pot installed.
FIX First, do the basic checks. 1) Make sure the outlet works—try plugging something else into it. 2) Check that the power cord is firmly plugged into the back of the Instant Pot AND into the wall. 3) Inspect the cord for any visible damage. If all that is good, the problem is likely internal. For a handy person, the next step is to unplug the pot, flip it over, and remove the few screws on the bottom cover. Look for a small, glass-encased fuse attached to the heating element assembly. If it's blown (you'll see a broken wire inside or blackening), that's your answer.
IF THAT DIDN'T WORK If the fuse looks fine, the issue could be the main control board. Unfortunately, that's not really a user-serviceable part. At that point, contacting Instant Pot support is your best bet, especially if it's still under warranty.
HEADS UP The #1 way to blow that thermal fuse is running the pot without the inner pot inside. The heating element gets way too hot, way too fast. Always double-check the stainless steel inner pot is in place before plugging it in.