Why the output on my iMac sound decreased significantly?

I noticed a few days ago the audio output on my iMac has dropped considerably. I have my computer hard wired to a nice stereo receiver, and the amount necessary to bring the receiver is much larger than a few days ago. I also have an Airport Express connected to the receiver for wireless streaming. I get a result even worse when I listen to music wirelessly on the stereo. So, the same thing happens if I broadcast wireless or hard wired. Is it a hardware problem or software? I don't know where to begin on this one. When I stream music from my iPhone on the same stereo, all right. So the problem must be with the computer. I'm lost here. Help, please.

Hello.  Have you reset the NVRAM?  If not, then follow the instructions here: How to reset the NVRAM on your Mac - Apple Support

If resetting the NVRAM does not work, try a SMC reset: reset the management system (SCM) controller on your Mac - Apple Support

Tags: Mac

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