It last worked about 30 seconds before I installed the update when it was connected to my telly. Disconnected it, applied the updates it rebooted and I went to bed.
Next day at the presentation, it was borked.
All settings have been checked a dozen times and the display adapter even recognised the HDMI device I connected it to at home (Sony TV) but no output.
Maybe I have put the cable on the wrong way round, so the little trons are all going back into my laptop?