Mostly good news.

First being I actually quite like Win10. Should have done it years ago.

The desktop I use as part of the AV system upgraded OK - after a bit of a
fight.

But the workshop one, not. I'd guess the motherboard is simply too old,
although Goggle says the processor OK for 64 bit Win 10

It's never used for gaming. I'm happy with 1920 x 1080 on the 24" monitor.
But:-

It has a sound card with balanced in and outs and all the pro digital
formats. Handy for me. I'd guess a new card that does that, and arm and a
leg. I also make use of the serial port (RS232) for MegaSquirt.

So what would the team recommend for a new motherboard? ATX. Already have
a 1T SSD as the main disc. And how much memory? And where from?

Not found Asus that reliable. Is there a better make?

--
*HOW DO THEY GET DEER TO CROSS THE ROAD ONLY AT THOSE YELLOW ROAD SIGNS?

Dave Plowman London SW
To e-mail, change noise into sound.