Check cables, see if it ever happens at 65-70 Hz or at 90 Hz

aye cables. Im still an advocate for taking it to a TV repair guy

If you have one available try it with another computer first though, just in case, it might turn out to be something else such as the computer PSU

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Phones?, Coils?, Magnets?, PSUs?...  Ya just dont know where to start these days...

 :cry:

Coils and Magnets = Same issue. Frame Coils = Large electromagnets (Coils) that spread the picture out from the electron gun in a CRT. Without them youll get the classic Horizontal Line, or Vertical Line, or really bright white dot.

PSU... dont see how it would affect it unless your graphics card has an additional tie in, and only supports certain ress when full power is given to it.

Cable it could be, or a dodgy unseated graphics card.

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This isnt looking good.

Ive now noticed occasional horizontal artifacts (like very brief tearing) across the screen.  (Theyre extremely fine though and very fast - and they only seem to appear when the monitor is warming up).

Its the graphics card isnt it?...    :cry:  :cry:
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If you think its the graphics card then try it on a different monitor

Ive reseated the card, given the case a good ol dusting and reattached all cables etc.  Ill run that for 24hrs and see what happens.

I wish I had a spare monitor to hand. :-)

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Arses.  Ill just get a new monitor - if I can find a good CRT on the Bay...