i found that you need really robust power supplies to run the BE cubes.

I bought a couple of (forget name brand) power supplies (850's) that said that they had 35 amp on the 12V rail and they wouldn't even turn on one then i tried a 750 watt Thermal take power supply same issue wouldn't even power up the unit.

then we tried corsair CX600 and they powered up and ran fine.

These BE cubes will call out power supply manufactures bluffs when it comes to how much power they say they make on the 12V rails and what they actually do