Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor

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Is my logic board dead

I opened my working late 2012 iMac to exchange hard drive (3TB fusion) against a HGST HE 6TB hard drive and wanted to replace the internal 128GB SSD from the fusion with a SSD Drive Kit and a 1TB SSD 2.5.

So I opened my imac , replaced the ssd with the SATA Blade module, pluged the sata cable in, repositioned everything, replaced the 3TB Seagate with the new HGST 6TB, checked everything and switched it on, but nothing happens. Only the LED 1 and 2 lightened the 3rd and 4th not.

So now I was worried, changed all parts back to the original ones, did the different resets, changed the rams, no difference.

When I switch it on I can hear the disk, the fan, but no chim and no display.

According to all I have read it looks like the logic board is damaged, but there is one thing that makes me hope: when I take off the rams I get the error beeps for having no rams.

Now I am at the end of my ideas. Anything else I can try to check if the logic board is really dead?

Every help is welcome!! Please!

Sorry for my bad English!

Answer this question I have this problem too

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Hook it up to an external monitor to help isolate the issue,

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You may have inadvertently blown out a component with the 6tb hard drive as it isn't supported by iMac and the power requirements may be beyond capabilities. Also if you used a sata blade it would need to be positioned so that none of the soldered metal components make contact with external casing or other metal components within the mac (resulting in a short).

I would check that all the SATA connectors are properly seated on the back of the motherboard and they have not been pinched during the prior installation. If one is pinched it will need to be replaced. The failure to have a tritone is an indication that the firmware is not communicating with one or more required components necessary to boot the system. (such as HDD, SSD, Video, etc) some components will result in a 3 beep sound indicating a problem such as keyboard, wifi, webcam are not connected.

Have you attempted to boot from an external HDD (hold down alt during power on to obtain boot drive options.) Note that the first time you put new hardware in the iMac it will take anywhere from 3 to 5 minutes to inspect and identify the hardware prior to the tritone.

I just upgraded my iMac with a SSD and it took 3 minutes before the tritone played and then took what seemed like a long time to actually start he boot progress bar. But after that initial boot it runs quickly. Hope this helps.

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Wolfram Strohschein will be eternally grateful.
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