Hey everyone. I was reluctant to update my 27inch i5 iMac with the new graphics card firmware update since I wasn't having any flickering issues. I finally caved in and did it thinking that nothing bad will happen, well of course something did. Ever since I updated it yesterday my computer makes a distinct and random popping sound from the speakers, it is soft but audible in my quiet room when I am working and it is driving me crazy. Has anyone else noticed this problem?