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akm3

macrumors 68020
Original poster
Nov 15, 2007
2,252
279
My iMac has started intermittently developing some weird not letters but ascii looking green flashing characters in the background (through windows, down to the desktop) that come and go.

I assume my video card is starting to go bad? It's the Mid 2010 27" iMac with the Radeon 5750.
 

MartinAppleGuy

macrumors 68020
Sep 27, 2013
2,247
889
My iMac has started intermittently developing some weird not letters but ascii looking green flashing characters in the background (through windows, down to the desktop) that come and go.

I assume my video card is starting to go bad? It's the Mid 2010 27" iMac with the Radeon 5750.

Could you post a screenshot/video the next time it happens. Really helps us help you :) Does sound like a GPU problem though. But by any chance to do have any 3rd party software from the internet that you can't 100% trust? Could also be a Trojan Horse application that is doing this.
 

scaredpoet

macrumors 604
Apr 6, 2007
6,628
360
More than likely it's a bad GPU, and the logic board will need to be replaced.
 
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