iMac - turning on but screen is black and no sound

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iMac Intel 24" EMC 2111

Model A1200 with 2.16 or 2.33 GHz Core 2 Duo processor

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Max @max9679

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发帖于: 2014年8月15日

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iMac - turning on but screen is black and no sound

Hi there!

My iMac worked without any problems for 7 years. A few days ago has sharply turn off the screen.

On pressing the power button there was no response. Disassembled case, when plugging in burned one diagnostic LED. Reinstall the memory. Started on and lit up all 4 LED's, fans worked well, audible diagnostics of DVD but black screen and no sounds from speakers. No sounds of HDD reading.

The question is what to change the inverter, motherboard or video card?

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Dan @danj

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发帖于: 2014年8月15日

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As you state the HD is not starting up either (no startup bong) I suspect your power supply is gone.

Remember you have multiple low voltage taps so some ares of the system may be working while others not.

But the real question here is why your power supply went. Do you have a surge suppressor or UPS? Did you get hit by lightening?

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No UPS or other power devices. Directly to the power plug. No lightening. I think this is age of iMac. (((

由 Max 完成的 2014年8月18日

Surge suppressor & UPS can protect your system i.e. Power supply. While you do need to replace the power supply consider getting a good surge suppressor at least for your system and system's peripheral devices. Yes, age can also be the cause but more often I see power surges as the issue.

由 Dan 完成的 2014年8月18日

Dan, thank you for your attention. But all 4 diagnostic LED's lit up! Why? I am ready to buy new power supply but not sure about this decision.

由 Max 完成的 2014年8月19日

OK that does change things. Lets start the diagnostic process again here. Review this Apple TN and tell us how far you get: Intel-based Mac: Startup sequence and error codes, symbols

由 Dan 完成的 2014年8月19日

Dan, thanks. Great article but nothing useful for me. All that I hear and see after pressing power button:

1. Power LED on and slow down off - absolutly normal.

2. DVD-ROM sound.

3. Coolers start working on maximum speed.

4. I hear special electronoise like turning on LCD display, but nothing on the screen.

5. That's all - no boot chime, no HDD reading sound - nothing, only noise of coolers.

由 Max 完成的 2014年8月21日

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No UPS or other power devices. Directly to the power plug. No lightening. I think this is age of iMac. ((( — Max
Surge suppressor & UPS can protect your system i.e. Power supply. While you do need to replace the power supply consider getting a good surge suppressor at least for your system and system's peripheral devices. Yes, age can also be the cause but more often I see power surges as the issue. — Dan
Dan, thank you for your attention. But all 4 diagnostic LED's lit up! Why? I am ready to buy new power supply but not sure about this decision. — Max
OK that does change things. Lets start the diagnostic process again here. Review this Apple TN and tell us how far you get: Intel-based Mac: Startup sequence and error codes, symbols — Dan
Dan, thanks. Great article but nothing useful for me. All that I hear and see after pressing power button:

1. Power LED on and slow down off - absolutly normal.

2. DVD-ROM sound.

3. Coolers start working on maximum speed.

4. I hear special electronoise like turning on LCD display, but nothing on the screen.

5. That's all - no boot chime, no HDD reading sound - nothing, only noise of coolers. — Max

score 1 · Answer 1 · 2014-08-21T01:14:58-07:00

mayer @mayer

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发帖于: 2014年8月21日

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This was about the end of the period of the bad capacitor issues but I'd look at the capacitors on the power supply and elsewhere, and see if any are swollen or leaking.

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iMac Intel 24" EMC 2111

iMac - turning on but screen is black and no sound

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