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Model A1418 / Mid 2014 / 1.4, 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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iMac won't boot up

Hi,

I have a 21.5" iMac,

The unit won't boot up just gets to the Apple logo and then thats it.

I have had it to a apple authorized repair centre and they say that the logic board has a problem (Apple part # 661-00147)

is the 661-00147 board the same as a 820-4668 board?

is the board fitted to other models? As I have a chance of getting a 27" unit which has a damage screen/case (same year)

Thanks, Mark

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I would recommend we do a bit more testing here to be sure. You'll need access to a second Mac which you can connect to your system. We'll use Target Disk Mode to see if we can gain access to the systems HD. Here's a good write up to explain things: Use target disk mode to share files between two Mac computers. Once you get your system up in Target Disk Mode using the other Mac you should have access to your systems HD. Use the other systems Disk Utility to see if the drive has problems if it does then that is more likely the issue here. You still might not see the HD from the other Mac if the drive has fully failed.

If you can't get the system to boot up in Target Disk Mode at all then thats more likely a logic board failure.

As to your direct questions:

Apple uses a basic logic board within a series of systems. As an example your system only has one system within the series iMac14,4. So generally one can't use the logic board number alone to know what it is. The better direction is to use the Apple part number which you have here. This should be a direct replacement of what you currently have:

You might want to look at getting the board that supports both a HD and blade SSD

That way you can add in custom blade SSD to gain some real performance!

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Frankly, it's seldom the logic board. Check this guys Google rating.

This sounds more like a hard drive or system corruption issue or possible virus.

Boot into the repair partition and run Disk Utilities. To do that hold down the option key on startup and select the repair drive.

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Yea that works too! I guess I'm spoiled ;-} I have spare systems to work off of.

If the drive has fully crapped out you may not be able to get to the hidden partition (Which is often the case with the MacBooks I service).

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@danj We were both answering this one at the same time. Yes, I have really gotten a lot of use out my Envoy drives. I posted about those in my seconds answer here: https://meta.ifixit.com/Answers/View/975...

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mark walsh zal eeuwig dankbaar zijn.
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