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If the screen and cluster in a 2020 Lincoln Navigator have no power, it could be an indication of an electrical issue, possibly a short circuit. Here are some possible causes:

1. Blown fuse: A blown fuse in the vehicle's fuse box can cause the screen and cluster to lose power. Check the owner's manual for the location of the fuse box and check the appropriate fuse(s) to see if they are blown. If so, replace them with the same rating of fuse.
2. Loose or damaged wiring: Wiring that has become loose or damaged can cause an electrical short circuit. Check the wiring connections leading to the screen and cluster to see if there are any visible signs of damage or looseness. If you notice any damage, consult a qualified technician to diagnose and repair the issue.
3. Faulty battery or alternator: If the battery or alternator is faulty, it can cause electrical issues throughout the vehicle, including loss of power to the screen and cluster. Check the battery voltage and charging system to make sure they are operating within normal limits. If not, replace the faulty component.
4. Malfunctioning screen or cluster: If the screen or cluster itself is malfunctioning, it can cause them to lose power. In this case, you may need to have the screen or cluster replaced.

In any case, if the issue persists after trying the above solutions, it's best to contact Lincoln customer support or a qualified technician for further assistance.