I am about to purchase a quad core 27 inch iMac and just want some reassurance from people locally (Australia) that I'm not buying a lemon. Reading bulletin boards can at times be counter intuitive as there tends to be more threads around issues and problems than anything else. But, this is what the boards, paradoxically are good for. So, I would like to hear from anyone that has purchased a quad core 27 inch iMac. Are you experiencing excessive noise from the fans, does your drive make funny sounds, do you have a yellow tinge on your screen. Any input would be greatly appreciated.