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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Mid 2010 iMac 27" Chime Black Screen

Hi,
I have mid 2010 iMAC 27 inch purchased 2011. It was working fine until a couple of months ago. Now, the issue is, the chime boot up sound loops and no screen display. I have removed the screen and tried to verify the Hard drive.
I bought a SATA cable from best buy and tried connecting the hard drive to mac book laptop using SATA cable.
https://www.bestbuy.com/site/sabrent-sat...

The hard drive didnt show up in the Macbook Pro. I thought hard drive is the problem. so I bought another hard drive but even that didn't seem to be recognized with the SATA cable.

Not sure how to connect the internal hard drives to the macbook pro.

3 Questions.
1) What component could have failed to load the iMAC Screen if it is not hard drive issue?
2) Should I try replacing logic board or graphics card or cpu?
3) What is the best way to trouble shoot connecting internal hard drive to macbook pro?

Update (11/24/23)

Hi, thanks for the help to start with diagnostic LEDs. But I cant seems to find the LEDs.

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Imac 27 Mid10

I checked this manual and at page 29. I cant find the LEDs please help.

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@ifixitshiv - Sorry, wrong board. The LEDs on this one are at the bottom left corner covers by a piece of tape near the RAM slot.

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Depending on the macOS version your systems are running you could get into not able to see your iMacs drive connected to your MacBook Pro. Apple altered the file system within High Sierra and newer (APFS) Vs the older Sierra (HFS+).

If you re-assemble the system there is a set of onboard diagnostic LEDs which you can help you focus in on what is failing

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Here’s a breakdown on the onboard diagnostic LEDs

  • LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board. This LED will remain ON while the iMac is connected to the AC power. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power is disconnected or the power supply is faulty.
  • LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
  • LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.
  • LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.

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