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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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iMac won't start after installing SSD and dust cleaning

Have SSD installed on my iMac and did dust cleaning, however, after putting everything back, it won’t start, here is what I found:

  1. Get the display unconnected.
  2. Connect the power cable, LED 1 lights up.
  3. Press power button, LED 2 lights up very shortly, then lights off quickly, 2 seconds later, LED2 lights up again, but off quickly, it then goes into this loop.
  4. I can see fans are spinning for a short of time when lED 2 lights up, but stop spinning when LED2 goes off.

I double checked everything, can’t see any cable connected wrongly.

Does anyone know what could be wrong here?

Many thanks,

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It seems you have a short on one connection. You could disconnect the hard drive and the LVDS (video) cable and start the iMac to check if the lights are stable.

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@lemerise - The display panel was removed, so, LVDS was not connected there. However, I did remove the hard drive connection from the logic board (both SSD and regular 3.5” hard drive connection, just left the optical drive connection there), but issue is the same, any thoughts?


would you try to let the two drives disconnected and just connect the screen and try to start the machine ? I'm not a iMac specialist but maybe the machine need to see a screen connection to fully start. If it start then the hard drive/SSD connections would have to be investigated.


@lemerise - Here is the update, I removed the logic board from the shell case and did the connection again, and found the followings:

1. Connect nothing at SATA 0 through 2, LED 2 is stable and booting continues.

2. Connect only optical drive at SATA 2, leave SATA 0 and 1 open (without any hard drives), same as #1 above.

3. Connect optical drive and one hard drive (either at SATA 0 or 1), LED 2 can stay with LED 3 lights up for about 10 or 15 seconds, then both LED 2 and 3 turned off, and continue this loop.

4. I physically check the SATA 0 and 1 connectors on logic board, they look fine to me. The SATA and power cables are OK (as it was tested on one of my other iMac desktop).

So, can I conclude that something is wrong with SATA 0 or 1 connectors at logic board itself? Any thoughts?



Did you try to start up the system via USB with an external drive (both internal drives disconnected) or with the installation disk that came with the iMac ? If it boot OK then you can investigate your drives and the internals connections. Also reseat your ram sticks just in case.


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Alex sarà eternamente grato.
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