I think, to be honest, it was having an internecine Microsoft scuffle with Teams, that has seemed to resolve itself.
Plus it doesn't seem to know how to go to sleep, close lid, go away, open lid, and erm, blank screen. There's probably a setting.
It's Windows 10, they wouldn't give me XP, not matter how nice I asked. We do have a typical long-suffering IT guy, oh it was blessed fun seeing him setting up the new starters yesterday. Best entertainment I've had for weeks.
I'm happier now I've made the Magic Mouse magic again and found an HDMI adaptor for the second monitor (it's a super-svelte Dell with only the single USB-C port). Apparently, it's a bunfight to get computers at the moment with the chip shortages (and we're taking on about 100 people this month, so I'm glad they didn't give me one that has been pre-sneezed on).