DEFECT? 24in iMac Black & white pixel flickering caused by hard drive?


ok started having issues 2008 imac (black & white pixel flickering) have apple care , obvious thing video card issue instead apple in wisdom sends replacement hard drive.

doubt hard drive issue. images attached enjoyment. has had issue? defect?

shot pic 3gs , other screenshot (no idea why screenshot captured pixels).

red lines confidentiality.
 

attached files:

that can't hd issue... have tried making new account? seems gpu issue, call apple , fixed
 


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