New iMac owners see ATI Radeon HD 4850-related lock-up issue

“In a near-repeat of an issue that plagued the aluminum iMac early on, owners of new iMacs equipped with the ATI Radeon HD 4850 graphics chipset are encountering frequent system freeze issues,” Aidan Malley reports for AppleInsider.

MacDailyNews Note: iMacs ship with either NVIDIA GeForce 9400M graphics or NVIDIA GeForce GT 120 with 256MB memory as the base configuration. Build-to-order options include: NVIDIA GeForce GT 130 graphics processor with 512MB of GDDR3 memory and ATI Radeon HD 4850 graphics processor with 512MB of GDDR3 memory.

Malley continues, “In the fall of 2007, owners (and AppleInsider) reported an interface freeze issue where the interface would become virtually unresponsive, even while some tasks would continue to run. The new issue is more severe as it appears to halt all activity, though in the previous situation Apple ultimately still needed to fix the freezing through a firmware update that modified the behavior of the video chipset itself.”

“Apple may already be aware of the issue. Some of those calling the company’s support line have heard from technicians that there are numerous reports and that a fix is in the works, possibly arriving along with the looming Mac OS X 10.5.7 update,” Malley reports.

Full article here.

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