Apple Computers are marketed on the fact that they have fewer problems, fewer viruses and are often viewed as more secure than the Windows-based competition. At the same time, Windows machines are marketed as cheaper than the Mac machines offered from Apple.
Apple has seen its market share climb in recent years with more users of the machines out there more viruses and exploits have been surfacing aimed at Mac computers. There have also been more glitches found inside Mac hardware. AppleInsider reports that some new iMac owners are reporting a video issue relating to the ATI Radeon HD 4850 video card inside some of the machines.
Owners of these machines are reporting that the system frequently freezes randomly causing the user to reboot. The freeze issues are not related to software running at the time of the freeze in Mac OS X. However, some users are saying that the freeze issue happens when running Windows in a Boot Camp partition where drivers or Mac software would not be the cause of an issue.
This isn’t the first graphics glitch for the iMac; a similar issue was noted in 2007 when the new aluminum iMac machines launched. In that instance the freeze would allow some programs to continue running, this time around the entire system halts. With the 2007 glitch, Apple was able to fix the problem with a firmware update.
There are threads on the Apple support forums relating to the issue and according to AppleInsider, Apple is aware of the issue. Some owners who have called the support line have been told that a fix is in the works and is expected to be rolled out with the Mac OS X 10.5.7 update. A few users report that replacement systems have been offered after troubleshooting failed. If this is a hardware problem, replacement systems may suffer from the same issue though.
In March 2009, DailyTech reported that some who purchased the new MacBook Pro machines were also seeing issues with graphics. The MacBook Pro users were having problems with the NVIDIA 9600M and 9400M GPUs. The problems with the notebooks manifested with green lines on the screen and the problem seemed to stem from the 9600M.