There's a small glitch in some of our very early units where the screw that tensions the motor's pulley comes dislodged while in transit. It's an easy fix and we'll be happy to take care of that for you.
The signature giveaway that this is the issue is that the LED & USB port function normally, and when the blender is activated it emits a "whirring" noise in lieu of spinning the pitcher blades.
Please send a message to email@example.com with the heading "Pulley Tension Failure" in the subject line. Our support team will be able to set you up with a prepaid return shipping label to send the left lid to us for repair. We'll tension the pulley and make sure your Coolest is in tip-top, ice grinding, shape!