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Hi so i haven an core i5 2011 imac and for what ever reason i went to update it to yosemite which I shouldn’t now it won’t even boot just stuck on the white screen.When it was on osx 10.6.8 it work well and i know the gpu is about dead so i followed this tutorial and got it to work https://youtu.be/9esGch26G_A Now it’s on this white screen and I can’t roll back the os and I’m stuck now.The drive is also lock so I can’t do that tutorial on the youtube video.Please help
White screen is usually indicative of a failed hard drive. Try booting from an external USB source. Also, do you have the 21” or the 27”? The 27” was the one with the GPU issues, not the 21”.
