Well, guess what? It was the CX750.
Cube runs perfectly on the OCZ 600W. Just a few hashes shy of 38GH for the last 8-9 hours. I've also discovered the Cubes work better though Slush's proxy than through BFG's proxy.
The PSU I bought is as follows:
http://www.amazon.co.uk/gp/product/B001GLFD54/ - £54.99
WAY cheaper than the Corsair, and it works.
The CX750 is back to it's normal job of powering my two Blades, 2 Jalapenos, USB hub, fans and various USB miners.
Maybe u got a dud. The ones I bought at Fry's for $60 work great!
Yeah, it must be a dud. That's why it's running all the other stuff with no issues at all.
The Cube didn't work with 2 other PSUs as well - a Dell 875W unit and an old transformer-based 30A 12V regulated PSU.You got everything working now, right?