well I just randomly clicked on it after doing something else for a while and it appears to almost be working.
4 downstream channels with good power.
upstream channel 7 (was 8 when last working).
network access 'allowed' in hub status, but I have no ip assigned.
<edit> got an ip now, is a new ip, and latency is currently the lowest I have ever seen at this time of day..
ballsed up reseg during peak?
will keep the tech appointment even if stays up for rest of night as I didnt like that I couldnt power up the modem in numerous attempts and then randomly it booted up.