Lightfoot, I just purchased a knc titan 4 cube setup off ebay. The first issue we had was two of the fans would not spin for us. We went ahead and installed new fans and they work great. We are having an issue with the controller board. None of those light flashing sequences you mentioned have been displayed on the unit.
When we boot the device, the screen on the controller board is blank.
Here is what the code says:
Configuring TPS65217 try 1 (then 2 then 3)
Waiting PGOOD for too long
DC/DC converter configuration failed!
ERROR: nSTATUS != when nCONFIG is HIGH
After a few attempts like this, the device reboots.
Any ideas on what we should do? If this is a controller board issue, and the ebay seller cannot resolve it, I would like to send the board out to you.