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i strongly recommend to use the 24 pin power configurations..
using 20 pin is giving the mobo minimal power... since you have such a heavy asset devices plan to use on that pc.. getting a higher watt PSU like 550watt pSU will settle the problem and make sure you use the 24 pin..
Ok, this was most likely obvious to everyone, but I managed to figure it out
Doing some reading up on ATX power supplies, I saw that the switches are momentary on/off switches. So I simply used a bit of copper wire to momentarily bridge pins 6 and 8 and the board powered up. Touching them again will shut the system down. On Tuesday, when the electronics shop opens up again, I will be buying myself a real atx power switch.
Now I have to get myself a better power supply.
I intend to run the system headless with two 1TB WD Green drives, a USB thumb drive, and nothing else (freeNAS). Is this PSU enough or should I return it and get a more powerful unit? Energy conservation is the key here as the unit will be on 24/7.
I think you've got your POWER ON/OFF question sorted out now.
I presume you're using the PicoPSU from Mini-Box. I'm running a similarly mini-PSU (though not from Mini-Box) and the motherboard runs fine. The main power connector supplies the motherboard alone and the steady state draw should only be in the region of 20W from what I've heard. The 20 pin ATX connector is fine for this purpose.
Your hard drives should be powered directly from the SATA power connector from the PicoPSU. The WD web site says that the read/write power draw is about 5W. With two drives that would be 10W.
That is 30W total which is way less than the 120W specification for the PicoPSU.
The great thing about using the PicoPSU (or something like it) is that it is small, efficient, and completely silent.