My Polaris pump (8 months old) will not start. I just makes a loud humming sound. After doing a little research online found that the most common problem is capacitor so went to local pool supplier and bought what they said was the correct replacement. Installed and still humming. Went back to store and they took one out of a new Polaris pump to make sure it was correct and I tried it. I felt confident it would work since all of the numbers matched uF, VAC, etc. However, no such luck, still humming. Help! I'm thinking possibly bad motor but shaft turns easily. Any ideas?