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Apple Operating System Error

Last Modified: 2020-10-08
Dear Expert
I have an all-in desktop made by apple I was trying to make an update from the internet got into some problems know I am getting this error saying (apple.com/support -3403D)  

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David FavorFractional CTO
Distinguished Expert 2019

This normally occurs when installing an OS version which is unsupported for your hardware.

Start by providing a screen capture image of Apple -> About to show your hardware.

Then mention OS version you're trying to install.

Tip: If your Mac came with physical install media, it's likely you can't install latest OS version.

You can try installing an older version from the App Store. And same applies. You can only install an OS on hardware versions the OS version supports.
Brian BEE Topic Advisor, Independent Technology Professional

That's a kernel panic error. It can mean there is a possible hardware failure, but before you do that, probably best to try and resintall the original OS using the disk that came with the system.
Kevin McpherspmIT Assistant


Dear David
I am not able to get into the system when I boot it will start the boot process, and after go into installation mode you will see a time bar indicating some form of download with a time indicting, but it will never finish. So, in short, I am not able to get into the system to check the hardware specification. Is there a way to boot in a save mode?
David FavorFractional CTO
Distinguished Expert 2019

Provide some history about how you got to this point.

You start by saying "I was trying to make an update from the internet".

This suggests...

1) The machine/hardware was working + running an older version of OSX.

Mention if this is true or false.

If true mention OSX version you were running, if you know the version.

2) You initiated either an update or full reinstall of some newer version of OSX.

If this is true, mention the OSX version you're attempting to install.

You may want to reset the SMC and PRAM before anything else. It's 2 quick "fixes" that can be done in a short time and frequently just makes it work.

Reset the SMC:
Unplug the power, then press and hold the power button for a few seconds.

Reset the PRAM:
Plug in the power cord.
Turn on the power.
Immediately press and hold command option p r
Keep holding until you hear it chime 3 times.  If you have a newer Mac, then you wont hear a chime.  You will need to pay attention to the screen and watch for it to briefly flash 3 times.

If your iMac OS X is new enough, boot into recovery mode by holding command r during startup.  If it gets into recovery mode, you can try to reinstall the OS.  If the recovery partition was destroyed, try Command option r to boot into internet recovery mode and reinstall the original OS X that came with the system.  If your system has a DVD/CD slot, you probably won't be able to do this at all.

Boot into Apple Diagnostics or Apple Hardware test (AHT) depending on whether you have a newer or older mac:
Turn on your Mac and immediately press and hold the d key.
Kevin McpherspmIT Assistant


Dear Serialband
I was able to access the system from the combination (Command r) also I was able to access the internet now I want to see if I can download an older version of the OS from the internet, how can this be done. The specification of the machine is mention below. I want to download OS:10.10.4

Family: iMac/eMac
Codename: ?
Gestalt ID: 406
Minimum OS: 10.6.3
Maximum OS: 10.10.4
Introduced: July 2010
Terminated: May 2011

CPU: Intel Core i3 ("Clarkdale")
CPU Speed: 3.06 GHz, 3.2 GHz, or quad-core 2.8 GHz Core-i5 ("Lynnfield")
CPU Cores: 2
FPU: integrated
Bus Speed: 2.5 GT/s (DMI)
Register Width: 64-bit
Data Bus Width: 64-bit
Address Bus Width: 64-bit
Level 1 Cache: 32 kB data, 32 kB instruction
Level 2 Cache: 256 kB per-core (512 kB total)
Level 3 Cache: 4 MB on-processor
RAM Type: PC3-10600 DDR3 SDRAM
Minimum RAM Speed: 1333 MHz
RAM slots: 4
Maximum RAM: 16 GB
Expansion Slots: SDXC card

https://support.apple.com/en-us/HT206886  Apple still has a download El Capitan (10.10) link.  http://updates-http.cdn-apple.com/2019/cert/061-41424-20191024-218af9ec-cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg

It might be easier to first reinstall your iMac, then download El Capitan and ugrade.

If your OS isn't running, you're going to have to download the OS on another computer, then extract the file and burn a USB stick first.
Kevin McpherspmIT Assistant


I am still working on the downloading the Image for the OS but i also need instruction on how to make an boot usb
Kevin McpherspmIT Assistant


I have check online regarding creating boot usd but it seems I have to have a MAC to create this boot USB but the only MAC that I have is the one I want to deploy the image
This one is on us!
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