iMac No Sound after Video Card Replacement

[MichaelsComputerServices]

I have an iMac 11,2 with El Capitan that came in for not booting. After replacing the video card and fixing the booting issue, it isn't outputting sound both internally or through the headphone jack. According to the customer, it was working before. It doesn't list "Speakers" under system preferences, but shows it under System Report for Intel Sound Card. The steps I have taken are as follows:
-Reinstalled El Capitan, and even Yosemite clean install (to narrow out OSX incompatibility)
-Verified all cabling
-Booted into Parted Magic and ran the audio test, which produced sound.
-Tried safe mode.

They are already saying I damaged it, so this will be probably be coming out of my pocket and I really don't want to buy a new logic board if I don't have to. I don't think they will want a USB audio card...

Do you think it is shot or are there other things I could try?

 

[Bizybone]

It's has been about 5 years since I've repaired a Mac and I do not know this is still relevant but have you tried resetting the PRAM?

http://macs.about.com/od/usingyourmac/qt/Reset-Pram.htm

 

[MichaelsComputerServices]

Yes I did try that too and didn't work :-(

 

[trevm999]

It is a strange one (since sound in Parted Magic works) but my guess is that there is something wrong with the new graphics card. I've seen issues before on Macs with replacing a component and causing something unrelated to act strangely, and it turns out to be a bad new part. I'd try putting the old graphics card back in (if it still works).

 

[Markverhyden]

It is a strange one (since sound in Parted Magic works) but my guess is that there is something wrong with the new graphics card. I've seen issues before on Macs with replacing a component and causing something unrelated to act strangely, and it turns out to be a bad new part. I'd try putting the old graphics card back in (if it still works).

My thoughts as well. Does the part number on the new card match the part number on the old card?

 

[cyabro]

Yea after you reset the PRAM do you get the startup chime?

 

[altrenda]

This is the type of situation where you want to boot from a known good OS X installation on an external drive. it makes it much easier to determine if it's hardware or software related. The old troubleshooting maxim of cutting the problem in half.

 

[MichaelsComputerServices]

I have gotten the start up chime before and after the replacement (and currently). I also replaced the hard drive as that tested with read errors. I installed a fresh OSX El Capitan.

 

[Bizybone]

Also, maybe check for system updates.

 

[geranium]

Maybe headphone jack issues?
http://apple.stackexchange.com/ques...ume-greyed-out-no-internal-speakers-available