i purchased a 27" imac dual core 3.06 when they were release about 7-8 months ago, since that day i have been battling issues with using recording software. Both Pro Tools and Logic, i get a whiney hum through my studio monitors both in record or playback, if i cease all audio after a couple of seconds, the hum goes away. Im guessing this is the audio engine enabling/disabling. I also have an issue where the machine will not send or recieve files over iChat.. the settings i have made are the same on both imac and MBP but MBP works fine Considering these machines are supposed to be used in the creative media industries dont you think i should be able to record in with no problems? Is this grounds enough to demand a replacement through Apple?