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I’d appreciate any hints to find a replacement for the video card for my iMac. Screen shows a checkerboard pattern, however I’am able to ssh the machine remotely without any problems. Thanks for your assistance. Regards, Alberto

Do you have an external display that you can attach to your system? Give it a try to see if the display is gone or the or the LDVS cable has a problem Vs the GPU. Sorry to say you’ll need to replace the entire logic board if the GPU is bad as the GPU is soldered directly on the logic board.