The old Aquaclear
HOB filters could run dry and heat up and stop working. But when they cooled down they would work again. Not sure about the newer models but hopefully they are the same.
Make sure the water level in the aquarium is above the motor on the filter. If the water level is too low it won't suck water into the tank.
Fill the filter before turning it on. They won't self prime from empty.
Take the motor off the filter case and check the impellor (magnet with 3 or 4 plastic blades on one end). You should be able to hold the magnet and gently turn the plastic blades. They should turn about 180 degrees and then stop. If you can turn the plastic blades around repeatedly whilst holding the magnet, the impellor needs replacing. You can glue the plastic blades to the impellor in an emergency. Just use super glue and let it dry for 10 minutes then try it out.
While the motor is off, plug it into a power socket and turn it on for a few seconds. See if the impellor spins.