24" 2.4, vendor 600. Have had the computer a week with no freezes. When I ran software update earlier in the week it listed the iMac Software update 1.3 (leopard) but I held off since I haven't been having any problems. Ran software update this morning and 1.3 was no longer available, but I installed the leopard update 10.5.1. This installed successfully (39 MB. only 1 reboot), and when I ran software update again the Graphics firmware update was now available.
I installed the firmware update (apparently successfully) but when I finished, software update still showed the the firmware update as being available. I tried installing it again, same results. According to the list of installed updates, it's on there twice. Anyone else experiencing this?