My first order of Gridseeds a while back from ZoomHash came with a Pi controller box. I never used it because I have set all my miners on an older Windows netbook. Anyways, I wanted to fool around with the Pi (ha!) and I can't get ANY video display. HDMI, DVI to HDMI, composite....nothing. Pi turns on (single red light).....but absolutely zero display. 
Any ideas?
Any ideas?
Zoomhash as already addressed this in their threads and on their website.
Contact them for the new SD image and there is an instruction sheet on how to fix it.
You will need a Windows computer with an SD card reader.