Apple released a new iMac firmware update yesterday, iMac Graphic FW Update 3.0, which is intended to fix issues with hanging and freezing on certain iMac models.
![Software Update](http://www.mactrast.com/wp-content/uploads/2012/02/Software-Update.jpg)
About iMac Graphic FW Update 3.0
This firmware update fixes a graphics issue that may cause an iMac to hang under certain conditions.
The update weights just 481KB and requires OS X Lion. Also, Apple does not specifically state which iMac models are eligible for the update, so it may be a good idea for iMac users to run Software Update on their machines to see if the update is available.