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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?

Answered! View the answer I have this problem too

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Posted: Mar 4, 2015

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

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4 Comments:

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?

Mar 4, 2015 by Tom

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

Mar 4, 2015 by Dan

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

Mar 23, 2015 by Tom

That's a bummer :-{

Mar 23, 2015 by Dan

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iMac Intel 21.5" EMC 2308

Internal display not working after gpu replacement

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