Black screen after resetting PRAM

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iMac Intel 21.5"

Guide di riparazione e supporto per gli iMac Intel da 21,5" di Apple.

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Yamani @yamani

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Postato: 16 giu 2017

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Black screen after resetting PRAM

Hello

I have iMac 21" 2011, it is working fine till yesterday. I was trying to boot it from USB but failed. After that I went to try a lot of options and read a lot of articles. One of them suggested resetting PRAM. I did reset PRAM and that was the end of my iMac. After resetting PRAM I only get black screen. I hear the startup chime and the keyboard is functioning and I hear sound when I click on it.

What to do now, I never though that resetting PRAM can destroy then device

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Is very odd the PRAM reset killed your machine. What was the exact procedure you have done? In which way the boot from usb failed?

18 giu 2017 da Oros

Please give us the model number and EMC number located on the botton side of the iMac stand.

19 giu 2017 da mayer

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Is very odd the PRAM reset killed your machine. What was the exact procedure you have done? In which way the boot from usb failed? — Oros
Please give us the model number and EMC number located on the botton side of the iMac stand. — mayer

mayer @mayer Rep: 685,3k MacHale Enterprises 3,4k 1,1k 2,6k · Answer 1 · 2017-06-19T06:41:24-07:00

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mayer @mayer

Rep: 685,3k

MacHale Enterprises

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Postato: 19 giu 2017

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Please give us the model number and EMC number located on the botton side of the iMac stand. Hook it up to an external monitor and see if the GPU is generating a video signal. Why were you trying to boot from an external USB, what was going wrong?

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Yamani @yamani Rep: 13 1 1 · Answer 2 · 2017-06-19T23:24:53-07:00

Yamani @yamani

Rep: 13

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Postato: 19 giu 2017

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Hi everyone

EMC 2428

Model 21" mid 2011

I went for a workshop. The guy said it is GPU issue and he fix it using heat treatment .

Now the system is loading but after the loading page it goes to black screen

I just got fed up and for proving it, I asked him to do PRAM setting and after that the issue returned

My conclusion is that I need to buy new one instead of fixing it

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iMac Intel 21.5"

Black screen after resetting PRAM

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