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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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White Screen on Power-Up

Hi,

I've got a problem with my iMac.

When I'm powering it up, im hearing the chime and than immediately get a totally white-screen.

So this occured since a few months, and today I powered it up again, seeing the Apple-Logo and then the Login-Screen! I was in a super-happy state as this happend.

But when I rebooted it, it still showed the Apple-Logo (-> Display & EFI working), but it stopped spinng the loading-cursor...

It did that about 10 times, until I did a NVRAM-Reset, from what moment on, it again displayed nothing but a white screen on power-up.

So, i did an NVRAM- and SMC-Reset a few times and than taking it apart, removed the HDD and the ODD (including cable from Logic-Board) as especially the ODD cable should be a weak-point causing this issue.

Still, nothing but white.

So, I need your advise... Does someone of you had kinda the same issue, or has some helpful tips?

Thanks very much in advance.

Arne

Answered! View the answer I have this problem too

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At this point its starting to look like your graphics card has gone. To verify plug in an external display (mini DisplayPort/Thunderbolt). If the external display works then the displays cable is damaged or disconnected.

Lastly you could try starting your system up in Target mode. Connect your system to another via FireWire or Thunderbolt to gain access to your hard drive.

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4 Comments:

It doesn´t work with an external display!

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Not good :-( You'll need to open the system up at this point.

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Do you think it´s the graphics card?

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Check the diagnostic LED's

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In my opinion this could be a hard drive issue. See if it will start up from the original system software DVD. Do what Dan said but please give us the last four figures of your serial number, (located on the bottom of your stand) so we know exactly which machine you have and can check it against recall numbers on this model.

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