That would have been the common sense approach.I would have thought it would have been better to have sent all the components back. Cpu, mobo and psu all together. That way Overclockers could have checked them all at the same time instead of back and forth.
Just want your rig up as soon as mate.
I just built my computer for the first time a few weeks ago. I had the same problem with nothing booting up and no lights at all on the motherboard. Turned out it was the cpu.
Let's hope its the PSU and the OP is all sorted eh. 
( Unfortunately as you are finding it can be really tricky to track down a problem like this and it's really frustrating. Let's hope it is that PSU. I would take that expensive graphics card out though to check first that you have fixed the fault. The board will power up without it and as long as you get signs of life you can power down and plug it in later.
So they've sent me a new PSU which has turned up today but unfortunately I'm at work until 7pm so probably won't get back until 8, so won't know if we're good to go until then.
I'll keep you posted![]()
What ...The....Guess who still doesn't have a PC that works....
This guy