I have recently bought an 24" iMac which is installed with Mac OS X 10.6 Snow Leopard. I am facing some randoms problems with it. The monitor does not display yellow color at all and there are some very faint shadows in the middle of the Monitor. The second problem which I am facing is the 24" iMac freezes while running high graphics applications and after rebooting the system the system gives error saying Airport Card not installed. Is this some operating system issue? or Is this some hardware problem? If any of you people are facing the same problems with the iMac 24" then please share some information about this issue.