No output on display

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iMac Intel 21.5" EMC 2428

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

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Dan Poulter @danpoulter

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Posted: Jun 10, 2018

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No output on display

Hi all,

I have an iMac (mid 2011 21.5) where the screen will no longer come on at all. The HDD had failed, I replaced it and put it back together but now I get no output. I cannot check if an external display would work because I don't think the iMac's display anything till booted on an external display (cant boot the Mac cause the HDD is new with no OS).

The connectors for the screen look to be seated right and I have tried to re-seat them also.

All 4 diagnostic LEDs light up on the Logic board but I still get no output on the screen.

Any advice would be appreciated.

Answer this question I have this problem too

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3 Comments:

Hi,

Thanks for this, all connections are sound in place and all look intact.

The Mac boots into Internet Recovery but only when the internal display is unplugged, is this normal? Or could something in the screen be causing the Mac not to boot?

Thanks.

Jun 11, 2018 by Dan Poulter

It could be that the backlight on the display died. Try shining a light onto the display when it is turned on and see if you see a startup screen or icons.

Jun 11, 2018 by Niels

Hi,

Thanks all! From what I can see/ can’t see, there is no image at all on the screen.

Jun 11, 2018 by Dan Poulter

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2 Answers

Hi,

Thanks for this, all connections are sound in place and all look intact.

The Mac boots into Internet Recovery but only when the internal display is unplugged, is this normal? Or could something in the screen be causing the Mac not to boot?

Thanks. — Dan Poulter
It could be that the backlight on the display died. Try shining a light onto the display when it is turned on and see if you see a startup screen or icons. — Niels
Hi,

Thanks all! From what I can see/ can’t see, there is no image at all on the screen. — Dan Poulter

lewis Barker @lewbar123 Rep: 737 9 7 1 · Answer 1 · 2018-06-10T13:38:46-07:00

lewis Barker @lewbar123

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Posted: Jun 10, 2018

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Try a pram reset . if that brings nothing try connecting an external display and try and enter into network recovery. When trying this you should see something on the external display,

https://support.apple.com/en-gb/ht204063 -PRAM REST

https://support.apple.com/en-gb/HT204904... RECOVERY

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