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原帖由: skclan ,

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Hi all,

i have an 2010 21,5” iMac with a faulty GPU.

I found a cheap GTX 260 from an Alienware Notebook.

I have put this GPU into my iMac, i hear the Startup-Sound, but i got only the first two LED’s light up. Is this normal, if the GPU doen’t have Apple Firmware on it ?

No screen anyway. I have tried High Sierra so far, but no luck. I will try El Capitan/Sierra.

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