i had the same problem. first question new out of the box grex. when you plug in the power cable to the grex do you get one red light on each axis and all of the outputs 1 through 16 should have a red lights? with no firmware loaded it should stay that way untill firmware is loaded and the and the auto-boot DLM is set to above 3 seconds default setting on mine was zero "out of the box".
if the grex lights up red and after a few seconds the red lights go out and the run light comes on then there may be a problem with the auto-boot DLM. i am assuming this is a new out of the box grex and this is the first time trying to use it right? if not and you have gotten it to talk with the computer before then disregard. other wise give gecko a call, i had to send the rabbitcore back to be reloaded there was a problem with one of the new programs they were trying and basicly the grex would boot on it's own and wouldn't allow access to it. when i got it back, i put it back together ,hooked it up through the home network and every thing was fine. when i talked to mariss at gecko he said mine was the third one with the problem and i think i ordered mine march 18th. they discovered that little bug around the same time i called on the 22 of march.