MONITOR SCREEN PROBLEMS - has anyone else had this ? HELP ..

Friends,
I am going nuts ( no don't answer that one ! ).
Recently ( possibly after the 10.5.2 graphics update - I can't exactly recall ) my LG flat screen monitor has started to look like a grainy 60's acid art house experiment !!
It is subtle but most disconcerting as I use my beloved G5 every day with Logic P8.
I have tried changing settings - calibration the lot... but still it looks strangely weird - like a TV that is not quite tuned in.
Gradients and shaded areas have weird lines instead of fine tones and artifacts appear around type and lines where was once beautiful and clear graphics.
When I first bought the LG 204WT 20" monitor 5 months ago it was fine !.
I have been using the recommended DVI output and tried different cables and the alternative input - the effect is still there but not quite as bad when using connector to RGB input.
The shaded areas in finder and Logic are almost transparent and grainy with a light blue / pink halo like effect around windows and graphic boxes.
I *don't know how to explain it really but I do hope someone out there may have some answers or at least have an inkling of what I'm trying to describe..*
As if I couldn't make matters worse I did an archive and install to roll back to 10.5.1 early hours of this morning - this didn;'t cure the problem and I lost the use of some music plug -ins and authorizations in the bargain.. Maybe it is time to call it a day and take a long break.
Really I should get a pen and paper and sit with my guitar an a darkened room for a few days.
I called the Mac shop where it was purchased then LG but with no help, advice or offers to replace it.
I guess the monitor basically works but this strange behaviour is arguably quite subtle and may not be considered 'serious' by most people !
*In the meantime if any of you lovely people could take my situation seriously and offer any practical advise I would be most appreciative.*
Many thanks - not quite lost it yet - Paul

Hi Pancenter,
Many thanks for taking time to message.
The resoloution is set as it should be and millions of colours is selected etc.
The screen has had several contrast / brightness adjustments and a factory reset with no improvement.
Also someone suggested the screen zoom might be on but this is all set as normal.
I have an imac which works fine and the difference is quite noticable - on the G5 w/ LG screen there are light blue and pink 'halo's ' around gray areas, graphics have strange patchy dots like a screen print and as I am looking and typing into this forum the gradient shaded area that says 'Apple Discussions' has very poor quality shading with horizontal blue lines !
I've also tested the cables and made sure there are no interferences - this is really weird...
I will try another monitor when I get chance - thanks again.
Paul

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