New
#31
Nailed it. Problem was the USB 3 driver.
I'd added a USB 3 external HD for backups when I re-installed the OS and that's what was causing the wake up fault. The fault disappeared when the disc was unplugged or plugged into a USB 2 port. I've installed a new driver and that's fixed it.
Thanks very much to all those who've helped. Everything seems to be working now and I'm progressively re-installing software. One day when I have the time and energy I'll do it all again from the ISO image to see how much easier it could have been.
One last question. What's the best utility to check performance as I add programs??