updated 11:10 pm EDT, Thu October 29, 2009
Choppy videos, maximum CPU load
Several owners of the new iMacs have reported problems when attempting to play Flash videos, according to several posts on Apple's Support pages. Forum poster Subcide first noticed the issue with a 27-inch iMac and the latest Flash player. YouTube playback appeared "really jerky" with distorted sound, while the Activity Monitor indicated the CPU usage was spiking to 105 percent every few seconds.
Several users have allegedly fixed the problem by rebooting the computer or going through a sleep and wake cycle, although the attempts have only provided a temporary solution. Other attempts to reinstall or restore Snow Leopard have also proven unsuccessful.
Forum poster HomerT claims that receiving a replacement 27-inch iMac has fixed the problems. An explanation for the underlying problems remains unclear, although some users speculate it could be related to overheating issues.