Error Code -3403D

tiredretired · Dec 15, 2015

That is what I get when I attempt to access the Apple Hardware Test by holding down Option/D during boot. This came about because I was getting the dreaded periodic 3 klaxons and reboot. I recently upgraded my system RAM from 4GB to 8GB along with changing out the internal HDD.

OWC advised me to reset the PRAM, which I have done. Does anyone know what that code means? The computer is running great and OWC says that it is important to do a PRAM reset whenever RAM is changed or upgraded. Makes sense to me, but the error code is bugging me. Does not allow me to progress to the Hardware Test.

As always, thanx in advance for any advice from the experts.

Cheers and MERRY CHRISTMAS to all.

harryb2448 · Dec 15, 2015

Sounds like you have a model 2009/2010 6.2 MacBook Pro which suffered this problem with graphics. Have a read of this from Apple Discussions:-

https://discussions.apple.com/thread/6852196?start=0&tstart=0

tiredretired · Dec 15, 2015

harryb2448 said:
Sounds like you have a model 2009/2010 6.2 MacBook Pro which suffered this problem with graphics. Have a read of this from Apple Discussions:-

https://discussions.apple.com/thread/6852196?start=0&tstart=0

No sir. I saw that thread in my search of the error code. So far I have come up empty in explaining the issue on an iMac. Even OWC was stumped. I have a Mid 2010 iMac 11.2 upgraded to 10.11.2, 1 TB HDD and 8 GB of RAM.

harryb2448 · Dec 15, 2015

Got the original disc which came with the iMac? If so run AHT from there. As your iMac was released prior to Lion OS X.7 the Option D will not work, only the original DVD:-

http://forums.macrumors.com/threads/apple-hw-test-error-code-3403d.1939078/

tiredretired · Dec 15, 2015

Got it. Thank you. Well, at least it is good to know I am not the only one who misplaces their discs. When I locate them, I will run the test, but in the meantime I am confident the PRAM reset will stop that godawful klaxon alarm and reset.

tiredretired · Dec 15, 2015

harryb2448 said:
Got the original disc which came with the iMac? If so run AHT from there. As your iMac was released prior to Lion OS X.7 the Option D will not work, only the original DVD:-

http://forums.macrumors.com/threads/apple-hw-test-error-code-3403d.1939078/

Found the two discs. Oh, happy day! Which disc do I use? I assume it is the Application Install DVD? I hate to assume that is why I am asking.;D

harryb2448 · Dec 15, 2015

Yep Bumstead Applications Disk 2. Go down to second last paragraph on this on using this form of AHT:-

https://support.apple.com/en-au/HT201257