Ok, just so I'm clear on this.
The power supply will turn on just fine until I connect it to the MB.
After the power supply is connected to the MB the MB must be connected to the front power button on the case, and I can no longer turn on the power supply via its own switch.
Even though the power switch on the power supply is turned on, the LCD on the power supply itself still will no longer turn on simply because it is connected to the MB.
If I disconnect the power supply from the MB, the power switch on the power supply will now power on the power supply.
I have never in all my years of building systems encountered a problem like this ... ever. However, this is one of those new power supplies that doesn't use a fan so it's new to me.
I just want to be clear that you all understand that the MB itself is preventing me from turning on the power supply via the power supplies own power switch. How in the *censored* is the MB and case power button preventing a self-contained power supply from turning on?