Ok so I started having issues with my 2008 iMac (Black & White pixel flickering) I have Apple Care and well the obvious thing would be that this is a video card issue but instead Apple in all its wisdom sends a replacement hard drive. I seriously doubt this is a hard drive issue. Images attached for enjoyment. Has anyone had this issue? Is this a defect? Shot the pic with my 3GS and the other is a screenshot (no idea why the screenshot captured the pixels). Red lines for confidentiality.