All memory out, no beep codes.
CMOS battery out, no change.
Only peripherals connected were keyboard, screen, mouse, but the monitor never goes live.
You'll see from another post that I have tested the PSUs as per the link in tyrednemotional's post and they seem OK.
Increasingly looking like a motherboard problem, but the PSU testing info suggests that I should now leave the PSUs overnight due to the potential for a dangerous discharge, so I'll have to leave Z's suggestion until tomorrow.
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