Check and see if all valves are turned in the appropriate positions. Sometimes homeowners forget to switch the valves from spa mode to pool mode or vice versa and wonder 'why isn't my pump pushing water?'. Another thing to consider is what type of pump you have. If you have an owners manual, check and see if you have a flooded suction pump or if it's self priming. You may need to dump water into the trap before seeing water flow through. You may also have faulty valves or check valves. Check your filter and make sure all positioning of valves are in proper place. If all else fails...call a pool professional. These small self performing tips are just something to consider to save some money in the long run in lieu of calling someone that may poke your eyes out with a service call and something as trivial as turning a valve. Hope this helps!