AFAIK AA means all tests OK.
Thank you for your knowledgeable & quick reply to my question (Copied below) It's greatly appreciated ...JIm
"I am getting a code AA on my xfx nforce 750i
I have the computer up & running & recently finished installing windows 7.
I haven't used it enough to notice any problems but I do see the code AA on the back of the tower. Can anyone tell me what this code means"?