It is, indeed a new power supply - but bought from the High Street and not shrink wapped (which suggests it was opened previously).
Test leads have been across the outputs during it's "running" - didn't think to search for volts after the freeze.
First time I tried to set time and date, it was a few minutes after boot up and it froze as soon as I started banging on keys - so I just stopped trying. Will try that again, today.
I've already started perusing the pages of
www.newegg.com for another ATX form, AMD motherboard, that will accept the same components (RAM pins, video card, CPU, 3xSATA) but does not have the name ASUS on the box. Disgraceful company that do not deserve one cent of anybodies money.
I would have ordered one - but America closes for the day tomorrow (Thursday) and the sales start on Friday.