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Internal display not working after gpu replacement

Hi all!

I have a late 2009 21.5" imac with an ati 4670 graphics card.

One day it won't boot anymore (white screen). If booting with the shift key helt down, the imac boots but without graphics acceleration.

So I replaced the graphics card. Now after turning it on, the display remains black. An external display (TV) works fine. So at the moment I can do everything on my TV, even graphics acceleration works.

But the main iMac display remains black. The backlight works. I triple checked if the fat display data cable sits tight and it seems ok.

So what can i do now?

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

좋은 질문 입니까?

예 아니요

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게시일: 2015년 3월 4일

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Sounds like the vertical sync cable is damaged or not connected correctly.

해당 답변은 도움이 되었습니까?

예 아니요

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댓글 4개:

the vertival sync cable? you mean the display data cable?! as far as I read the display should work but vibrate with disconnected v-sync cable. or am I wrong?

Tom 의 2015년 3월 4일

It's needed! Did you forget to connect it? And it's correctly inserted.

Dan 의 2015년 3월 4일

I took it to a local apple reseller. It was the lcd panel...

Tom 의 2015년 3월 23일

That's a bummer :-{

Dan 의 2015년 3월 23일

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iMac Intel 21.5" EMC 2308

Internal display not working after gpu replacement

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