iMac Black Screen, No Chime. 1 LED.

Question

iMac Intel 21.5インチEMC 2428

モデル番号A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5もしくは2.8 GHz Core i7プロセッサ

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Thomas Govern @ohytue

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投稿日: 2019年5月22日

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iMac Black Screen, No Chime. 1 LED.

Hi there,

The graphics card in our iMac Mid 2011 model packed in. Upon replacing the card, the Mac now has a black screen and does not chime.

On the logic board, only one LED comes on. If the computer is turned on, this led remains on then after roughly 10 seconds, the fans increase to their maximum speed.

I’ve tried testing the pin voltages.

Pin 3 has zero volts when I assume it should be 5V to power the Hard Drive?

Could anyone advise me on what steps to take? I’m stumped at this point.

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Are you sure the issue was the GPU board to start with. This sounds more like a bad power supply.

Dan さんによる2019年5月22日

@danj Yes. Originally, The Mac was stuck in a boot loop with Vertical Green bars across the Boot Screen.

Thomas Govern さんによる2019年5月22日

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Are you sure the issue was the GPU board to start with. This sounds more like a bad power supply. — Dan
@danj Yes. Originally, The Mac was stuck in a boot loop with Vertical Green bars across the Boot Screen. — Thomas Govern