Apple today also released 27-inch iMac EFI FW Update 1.0 which is recommended for all quad-core Intel Core i5 and Core i7 processors 27-inch iMacs.
This update addresses the following:
• Resolves an issue that sometimes caused high processor utilization while playing audio through the headphone output mini-jack.
• Resolves an issue that prevented the display backlight from turning on after powering on the iMac.
Note: When your computer restarts a gray screen will appear with a status bar to indicate the progress of the update. Do not disturb or shut off the power on your iMac during this update.
27-inch iMac SMC Firmware Update 1.0 and 27-inch iMac EFI FW Update 1.0 are available via Software Update and also as standalone installers.
More info and download links:
• 27-inch iMac SMC Firmware Update 1.0 – (397 KB)
• 27-inch iMac EFI FW Update 1.0 – (2.1 MB)
[Thanks to MacDailyNews Reader “Fred Mertz” for the heads up.]
I’ve not noticed this issue, only how fast the machine is.
It will be snappy!!!
What about the faint touch of yellow at the bottom of my screen?
no see yellow…
After the update restart, and the grey blank screen appears. your fans will kick on, sounding a bit like winds in the forest… also a bit of dust will fly above your imac from the vents … kinda like pollen. Haven’t noticed any lowering of CPU usage since the update though… guess the audio on mine was fine.