Hi all, I've had a quick search around BR and a scan through the manual and am so far non the wiser as to what this fault could be- Basically all of our lanterns came down last week for maintenance of all the generics and PATing, and, after re-rigging our movers two of them seemed to have aquired a similar problem... When you turn one of the the Mac 550's on, you hear the fans power up for a second or so, the display shows #### and then the whole unit powers down again. The second one does the same, but instead of just turning off, seems to restart itself and powers up fine. Our other two Mac 550's seem to be behaving as normal. None of the movers have been opened up over the past few weeks, but they have been PAT tested- the only thing I can come up with without taking the covers off (I'm not too au fait with the inner workings of the 550's) is that maybe someone has run an incorrect test on them? Has anyone ever seen this sort of problem before? If no-one can come up with any suggestions I'll be ringing Stage Electrics and asking them to pop along to have a look so obviously I'll report back when I do find out what the problem is! Thanks, Ian edit: spelling