Water/Ice Dispenser is not working

Question

We just moved in Friday and our landlord has no idea why the water doesn't dispense and the ice isn't being made. I checked the water line from the wall and the water is flowing just fine...so the fridge is getting water. My landlord has removed the filter, but hasn't put a new one back in yet...I tried putting the old filter back in, but the water is still not dispensing. Any suggestions? Thanks