I got the same problem, but it started today. The setup was working fine before. Now, when the LEDs are connected, the power light on the box turns off. Also, the yellow/green LED on the power bar blinks very slowly instead of staying on. It looks like a short-circuit but nothing was changed, so it seems weird.
This is not a common issue but has happened to a few customers in the past. We were able to fix the issue by providing replacement LEDs. Please contact us directly through the contact form on our website and include your order number and current shipping address in your message. I will then arrange for a replacement to be shipped if your order is still under warranty. Feel free to link to this post in your message.