Artifacts, Monitor or GPU to blame?

[Glitcher]

Hey all. Any chance of some help with this strange issue I've been having?

I recently bought a second 24" monitor; HP w2448hc, to go with my slightly older HP w2408h

First of all everything was fine; both worked well, although there was a slight issue with colour difference I put that down to the age difference of the monitors and got on with my life.

Unfortunately, after playing a game without disabling my second monitor, I started getting collections of odd coloured pixels on my new monitor, as if it was having problems rendering certain colours. These pixels vary in intensity, as if it was tied to GPU temperature, but only show up on my new monitor (Which I've tried in either GPU port)

Here's a couple of images illustrating the issue:

Without artifacts: http://img129.imageshack.us/img129/2554/cimg0434ho0.jpg (http://imageshack.us)

With artifacts: http://img129.imageshack.us/img129/3064/cimg0433ia5.jpg (http://imageshack.us)

It's worth mentioning that these don't show up on a system screenshot.

GPU is 8800 ultra
Monitors are as mentioned above

Any ideas?

[IOS&M]

monitor can't cause artifacts ... it's a GPU problem.

[Glitcher]

Thanks for the reply

I'm using "artifacts" as an umbrella term for unwanted distortion to the displayed image.

I don't think it's too much of a stretch of the imagination to imagine that this particular monitor has problem displaying certain colour types, this issue being exasabated by the monitors temperature perhaps?

[IOS&M]

I don' really get what you mean by the term - the monitors temps ?
the monitr can't "transfer" it's heat to the video card ...

[Glitcher]

What I'm saying is that the temperature of the monitor's internal workings could be effecting its faulty display. Of course I'm not suggesting the monitor is overheating the gpu.

The reason I'm leaning towards the monitor to being the culprit is that usually if it's a GPU issue it's possible to screenshot it.

[IOS&M]

can't you connect the other monitor and see if the problem
appears on it also ? this way you can do a good troubleshooting ...

[MARCI]

If you turn the monitor off for 3 or 4 hours, allow it to return to ambient, then power it on, are the "artifacts" still there? If so, unlikely to be heat issue on monitor.. Or test monitor on another pc..