Connection between display and power bar board lost

[zfreak_1125]

Ok, I reloaded all of the Robo-Tank sketches, switched patch cables and connected it all up...still same problem. So I connected just the display board and DUE and checked voltages. 

Ethernet Port Voltages
pin 8 - 12v
pin 5 - 3.2v
pin 3 - 5.03v

I checked both TX1 & TX2 on the DUE and bother are outputting 3.3v. 

Thanks for the help.