TS3824: iMac (Mid 2011): Unresponsive white screen on startup or vertical lines on screen

Learn about iMac (Mid 2011): Unresponsive white screen on startup or vertical lines on screen
ladamaris

Q: How can we install the iMac Graphics Firmware Update if the screen is white and I can't get to the Apple menu?

How can I install the iMac Graphics Firmware Update 2.0, if the screen is white and I can't get to the Apple menu?  My computer has 5 vertical purple lines against white screen at startup before the Apple logo appears and the spinning gear...then everything disappears and the screen hangs on the white screen.  I have tried unplugging and removing all my peripherals and the COMMAND, OPTION, P & R set of keys and still nothing.  I have tried COMMAND C to start up from cd and it only tells me to turn off the computer and turn it back on.  I found information on Apple's Support pages regarding the iMac Graphics Firmware Update but I am unable to download and install if I can't get to the Apple menu.  Can anyone help?

iMac (27-inch Mid 2011), OS X Mountain Lion (10.8.3)

Posted on May 28, 2013 11:24 AM

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Q: How can we install the iMac Graphics Firmware Update if the screen is white and I can't get to the Apple menu?

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