I had a power supply fail on my Snap4000 and so I bypassed it (and the central controller circuit) matching the color coded wires from a 425W ATX power supply. For now I don't mind that the PSU would sit outside of the SNAP's case because my priority is to perform an emergency transfer of my data.
I did short the green wire on the ATX PS to get it to remain powered on per the Wikipedia (
http://en.wikipedia.org/wiki/ATX):
At first I hadn't recognized the need to bypass the control circuit and that resulted in sporadic power up and down. It now powers up but only the System light is blinking. Very consistent about once per second. The other three lights are off (no Link light, no Drive light, etc).
1 Snap 4000 - bad PSU, with 4x320 Seagates, Raid5