Dmx??????

I Guys,


Like a lot of you know, i'm using Dl.2 in a club.
Recently(last week) we've lost control on a dl.2 and I want to know what would cause this? Dmx cable are all good and tested. When we boot up the dl.2 on the screen all we see is DL.2 HIGHEND SYSTEMS No dmx page nothings...

I want to know what to do to repair this thanks:)

Anthony