Screen artefacts gtx 680 on cMP 4,1

[Powermange]

Hi all. Just got a used 680 to replace a 6870. Its flashed now but i have a problem with green dots/artefacts on the 30" ACD. The problem was there before flash also. It persists in windows as well. On both dual link dvi's. But only on the 30" my two 20" are fine regardless of port.

 

[Lareson]

To me, it looks like you have screen burn-in if its only appearing on the 30". It looks like it has a very distinct shape to it.

I think there are a few programs around the web that can try and fix it, but won't guarantee to get rid of it.

If it doesn't do that when you go back to your old GPU, then you might have a faulty dual-DVI port on the card.

 

[Powermange]

Trying to fault isolate here now. Problem persists using only original GT120 with only 30" ACD.

During boot and when in desktop and in windows boot + desktop

Monitor cable? (Likely)
Driver? (During boot/desktop on both os, unlikely)

Anyone seen this?

 

[Powermange]

Its not burn in as it moves around with graphics or windows.

It appears in between colour gradients almost looks like 8bit colour or something

 

[Powermange]

Ok solved attacking cable connecting to card resulted in a varying screen changes one of which was good. So its a connector problem

Time to clean connector, but how?

 

[Powermange]

Arrgh! The bloody thing can be made to go away with manipulation of the connector bit comes back after a sleep or restart! WTF!!

 

[mikeboss]

the problem might be the LCDisplay itself. there were hundreds if not thousands of posts about this in the Apple discussions forum.

 

[SDAVE]

I've seen this happen on other monitors with a machine I used to work on. It's just the card itself. Time to get a different one, preferrably one that has a Mac firmware.

\I've seen this happen on a brand new 4k monitor with a gtx680.

 

[Pending]

I've seen this happen on other monitors with a machine I used to work on. It's just the card itself. Time to get a different one, preferrably one that has a Mac firmware.

\I've seen this happen on a brand new 4k monitor with a gtx680.

You seem pretty sure but the OP said it occurred with the original GT120 as well.

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Arrgh! The bloody thing can be made to go away with manipulation of the connector bit comes back after a sleep or restart! WTF!!

Which connector are you 'manipulating'?
Are there any bent pins?

 

[SDAVE]

You seem pretty sure but the OP said it occurred with the original GT120 as well.

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Which connector are you 'manipulating'?
Are there any bent pins?

It may be his 30" ACD, but I've had this happen to me on multiple monitors especially after I used programs like After Effects.

 

[nigelbb]

Try a new cable.

 

[mikeboss]

Try a new cable.

the cable on the 30" ACD is fixed. I'm pretty sure it's the TMDS chip or controller board in the display.

 

[nigelbb]

the cable on the 30" ACD is fixed.

Gosh! I never knew that. How incredibly dumb. Fixed cables are usually the hallmark of cheap & nasty models.