White screen at boot

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iMac Intel 27インチ EMC 2390

モデル番号A1312 / Mid 2010 / 3.2 GHz Core i3もしくは2.8 & 3.6 GHz Core i5もしくは2.93 GHz Core i7, ID iMac11,3

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genik @genik

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投稿日: 2020年7月16日

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White screen at boot

Every now and then, i get a white screen, that seems to cover up the users login page. This occurs just before the Apple logo and the Chime sound. Normally when this occurs, thinking that its a freeze, i do a restart by using the power button. But today i acted as if there was no white screen and i pressed the buttons as if i was logging in to my user and it worked. This white screen seemed as if it was a cover up.

What could be wrong? Is there anything i can do about it? Any suggestions?

I noticed that i can log in despite the whitish screen i see at boot. I have 2 users, one is a guest and the other is admin. Entering the admin user without seeing is not so easy, but entering the guest can be done with closed eyes since i can enter it simply by pressing enter on the withish screen. Apparently logging in works even if i cant see the screen.

So i enter the guest and then i log out and enter the admin and it all works fine. Isnt that strange? Maybe just maybe might this be something else?

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Dan @danj

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投稿日: 2020年7月16日

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The white screen indicative of a failing GPU board! iMacのIntel 27インチ(Late 2009/Mid 2010) のグラフィックカードの交換

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Is there a way (an applications perhaps) that i could know at what state of functionality the graphics card is?

genik さんによる2020年7月16日

Your system originally came with either a ATI (AMD) Radeon HD 5670 or Radeon HD 5750 graphics MXM board.

To find out go to About This Mac > System Report click on Graphics/Displays section you should see two graphic services the built-in Intel and the MXM board.

Dan さんによる2020年7月16日

Dan, i was thinking... if it was a failing GPUboard, should i have graphic issues in other cases as im working? Why does this happen only at boot, and why if i reboot it works fine? Are there any answers to these questions? Just wondering :-)

genik さんによる2020年8月11日

Thats the difference between Failing and Failed ;-}

Dan さんによる2020年8月11日

I guess in my mind... "failing" is continuous procedure of partial failure until it reaches the "failed point" of no return.

What i want to ask, which is important is... How can i see my files if the board reaches to the point of no return and the iMac although it boots i cannot see the contents. Is there a way i can see my desktop and manage my files for a short period of time until i migrate them to a diff computer?

genik さんによる2020年8月20日

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Is there a way (an applications perhaps) that i could know at what state of functionality the graphics card is? — genik
Your system originally came with either a ATI (AMD) Radeon HD 5670 or Radeon HD 5750 graphics MXM board.

To find out go to About This Mac > System Report click on Graphics/Displays section you should see two graphic services the built-in Intel and the MXM board. — Dan
Dan, i was thinking... if it was a failing GPUboard, should i have graphic issues in other cases as im working? Why does this happen only at boot, and why if i reboot it works fine? Are there any answers to these questions? Just wondering :-) — genik
I guess in my mind... "failing" is continuous procedure of partial failure until it reaches the "failed point" of no return.

What i want to ask, which is important is... How can i see my files if the board reaches to the point of no return and the iMac although it boots i cannot see the contents. Is there a way i can see my desktop and manage my files for a short period of time until i migrate them to a diff computer? — genik

iMac Intel 27インチ EMC 2390

White screen at boot

Update (08/24/2020)

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