I've tested both power supplies using the link you gave me, many thanks! I get the same result with both, that is, the PSU fan runs, and the connected device runs (in the case the HDD). So I'll assume at this point that both PSUs are working. However, there's a note at the end of the instructions that say to leave the PSU overnight due to a potential for a high discharge, so that's effectively scuttled any further progress today. Never mind, we're in lockdown and I will have plenty of time tomorrow :-)
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