I had a new one make that awful noise and it turned out to be a tiny piece of packaging stuck under the blade assembly. Pulled it apart and found a clear film ring I missed. Problem gone. Unplug yours and take the jar off and and look closely for any thin plastic or paper tucked under the blade base or stuck to the sealing ring. Make sure the sealing ring is present and lying flat. If it is missing or folded, the metal can scrape under load.
Check how the jar sits on the base too. If the base rocks on the counter or if the jar does not twist fully into place, the drive teeth can meet at an angle and chatter. Try setting the base on a folded dish towel to see if the noise is just vibration from a hard counter. Then do a short test with a cup of water on the lowest speed. If pressing the jar straight down changes the sound, it was not locking square and needs a firmer twist into place. If none of that changes the sound, spin the blades by hand with a towel and listen. Smooth and quiet means the motor area is suspect. Rough or grindy feel means the bearing in the blade unit is bad. Since it is new, do not keep running it if it still grinds. Swap it through the seller or the manufacturer so you can get back to smoothies without the drama.
