The fan in the hood will start to get loud eventually and needs replacement over time. The fan in my hood started to go after about a year and a half of use, just contact pinky at redsea and she will be able to help you get a replacement for it.
As for the return pump, check to make sure that all of the air is out of the pump, (usually when filling a new tank or changing water, air will get inside the pumps and prevent them from working)
What I normally do is I either point the directional nozzle in its most upward position to let water flow into the pump, or if there is alot of air in the pump I will remove the lockline (the directional tubing on the pump, that sits inside the display tank, that allows direction of flow) once the lockline is removed I will tilt the pump upward and let it fill with water that way, by placing my hand on the back side of the pump and pulling it out of the glass hole a little.
This usually get the pumps working again.
If you have already done this, and the pump is still not working, once again contact pinky at red sea's customer service department and she will be able to help you out.