Leon, I love your computer-related threads, they're very entertaining mate and I can relate.
Houghy used to call my old Windows XP tower - "Lazarus" because I had brought it back to life so many times.
Mate what Malcolm suggested is spot on.
Get a new IEC power cord, that's the problem.
I had the very same thing happen to 'Lazarus' and it was simply a loose power cord.
Once I bought a new power cord, the problem was fixed.
RB