My control board took a dump on me a few days ago. The unit powers up and the Aux LED on the board lights up, but I don't get any activity out of the other 4 LED's on the board. The hashing boards should be fine. There was no power failure or surge, if for some reason they don't work I will take them back. Escrow is a must!
One of them had a PCI-E cable melt and the 6 pin plug was professionally replaced a few months back and has since been working fine. I have had this unit running @ 1.5TH it's entire life. I can't take any pictures right now, but will try to take it apart tonight and get some photos up.
Sp20 or sp20e?