Supercharger not working

Engine was rebuilt 2,000 miles ago, supposedly the supercharger was also rebuilt, but there is no boost from the supercharger, no whine acts like it is not working. Where should I check first, the coupler? Do the embellor blades have to be synchronized or a aligned? Do I need to remove the supercharger to check its operation. Found some of the vacuum lines not properly routed, corrected but no difference? Where do I start?