Edge Juice w/Attitude monitor problem

[jimmyv13]

A buddy of mine who doesn't frequent the forums asked me to help him with his Edge. He bought his '06 F250 6.0L PSD with the Edge Juice w/Attitude installed and it ran great. He unplugged the display for some time, a couple of months, and when he tried to plug the unit back in, there's no display. The unit shows a blank screen, has power, just no monitoring. He said he followed the instructions in the manual. The canned tunes work fine, there's just no monitoring on the Attitude. I feel it something simple...my Edge has done this and I simply shut my truck down and turned the key back to on and it worked. This didn't work for his unfortunately.

Any quick tips I should let him know?

Thanks.