Odd Patterns in Display After Sleep

Recently, after either waking the iMac from sleep, or (tonight) after restarting it, bizarre but repeating patterns appear on the screen, the only remedy for which is to shut down the computer and restart. The patterns have typically been small grey dots, but tonight it was some strange geometric shape.
Is this one of the problems that is being fixed by the extended repair program? My iMac's serial number is within the range of those covered by the program.
I've tried a lot of other options (repairing permissions, deleting the PowerManagement.plist file, running OS Cocktail) but the problem keeps happening.

I would suggest that you have Apple look at it. Mine displayed a pixelated pattern when switching users and I had some bloated capacitors.

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