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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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iMac white screen of death after updating it to Yosemite.

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

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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”.

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Hi,thanks for replying.

The iMac i have is a 21.5" As seen in this pictures(https://ibb.co/album/ezNnka) i thought it might be a gpu issue.Also what should i try to boot from an external USB source?Mac os?

Thanks,

Honghongleong.

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Yes Mac OS X

Pre-Installed MacOS: X 10.6.6 (10J4026) Maximum MacOS: X 10.13.x*

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Alright I’ll give it a try once i reached home.

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I've tried OS X Lion and it also booted up with a white screen.

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Hook it up to an external monitor and see if you are getting anything. This is unusual, it should have booted from the Lion. Please test that start up USB device on another Mac that will run it.

I would also like you to try just booting into Safe Mode with your internal drive by holding down the Shift key on startup, you may have an issue with the software you installed to turn off the graphic driver.

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