iMac doesn’t work with new graphics card

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iMac Intel 21.5" EMC 2308

Model A1311 / Late 2009 / 3.06 or 3.33 GHz Core 2 Duo processor

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Hugo Silva @hugosilva15990

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发帖于: 2020年7月12日

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iMac doesn’t work with new graphics card

Hi guys, my iMac 21.5 2009 started having vertical lines, so I bought a new graphics card, exactly same model, but now it isn’t working properly. Sometimes it boots, and works perfectly, for 2 or 3 days. Sometimes shutdowns unexpectedly, with error -128. Other times simply doesn’t boot. I have tried again with the old graphics card and it works perfectly(of course with the vertical lines). What can I do? Is the new graphics card faulty?

thanks

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Did you try an external monitor to see if the problem shows up there?

Post a few pics so we can see what you see 在已经存在的问题里加入图片

由 Dan 完成的 2020年7月12日

How can I try with an external monitor?

由 Hugo Silva 完成的 2020年7月12日

You'll need a Mini DisplayPort to ?? cable depending on what your external display needs. As an example:

● Mini DisplayPort to DisplayPort Display Cable

● Mini DisplayPort to HDMI Display Adapter Cable

由 Dan 完成的 2020年7月13日

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Did you try an external monitor to see if the problem shows up there?

Post a few pics so we can see what you see 在已经存在的问题里加入图片 — Dan
You'll need a Mini DisplayPort to ?? cable depending on what your external display needs. As an example:

● Mini DisplayPort to DisplayPort Display Cable

● Mini DisplayPort to HDMI Display Adapter Cable — Dan