All controllers have been triple tested at factory, so the change of defective on arrival is very small. Are you using the power adapter shipped with the controller or are you using your own power adapter? I have never heard of the issue of a ‘squealing loud’ sound — is it coming from the controller or the power adapter? You should send a support ticket and arrange for support. The forum is for community-based discussions and we may not respond to forum posts every day. If you have an urgent problem that needs support, you should use the support system. We need your order number and sometimes need you to export your configurations, which are not suitable for posting on the forum. Leaving such questions on the forum will likely result in delay in handling the request.