The post said "hold down the front power button until the power light blinks, then let it go and hit it one more time," so yes, that sounds about right. Sorry for the old post but that is the only one I could find on Cox forum. Pretty sure that is when the Contour 6 boxes came out. I don't think anything have changed by way of accessing the diagnostic but I am not sure.
What my question is does OnDemand use older OOB for upstream or DOCSIS? Anyone know? My knowledge is out of date as I haven't used Cox cable since the DCX3200 series. Apologies if I took the post off track.