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A1418 / EMC 2833 / Late 2015 / 3.1 GHz Core i5 or 3.3GHz Core i7 Processor. Released October 13, 2015.

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Chime but delayed display

Hi guys,

We got an imac in that chimes on power on but it takes 10’s of minutes before we actually see anything on the display.

Sometimes it will attempt to boot from the internal drive (we end up seeing an apple logo and loading bar) but it just restarts.

After trying to go into the boot menu (option key) and not getting anything on the screen, we left it alone for a while and it automatically booted into a catalina based recovery mode. We tried plugging in an external tester and can see it in disk util, but cannot see the internal drive listed there.

When we try to install an OS on our tester, it says we don’t have the firmware to do so so.

Before we open this one up (adhesive based), is this looking like a logic board issue or could a bad internal drive cause this type of behavior?

Thanks!

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Using a USB keyboard what happens when you try to go into Target Disk Mode?

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@danj Hi Dan, same thing. The backlight comes on but nothing on the screen.

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@repairk - If thats the case you got a logic board issue as the display should be showing the Thunderbolt Icon on it!

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So for anyone wondering, this was indeed a drive issue. One of our techs just opened it up and removed the drive. It boots fine now with our tester drives, though we have not tested it extensively, but it’s definitely looking like drive was at fault in this case.

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This doesn't make sense!

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