I’ve replaced the hard disk in numerous iMacs over the years. It’s a fairly straight-forward repair, although not for everyone. But, in 2-3 cases recently, I would replace the disk, re-install the Mac OS X, restore all user data from the old disk (or a Time Machine backup), and return the computer to the user only to have them call me back in the following days, saying “The microphone doesn’t work.”
I would think to myself, “Oh, I must have missed a cable when I was mucking about inside” and I’d tell the client the same. But, time and time again, that wasn’t it.
Google to the rescue. I found many people with the same problem. And many “this worked for me” replies. Some people said, “Hit it like the Fonz.” Others suggested resetting the PRAM. I tried every suggestion I could find, but to no end. I did learn that people couldn’t be heard on Skype when speaking with a normal voice, but if they spoke REALLY LOUDLY, the other party could barely hear what was being said.
Now, I was really anxious, nervous and worried about the work I had done. Had I done something that broke the microphone? Was the design of the iMac such that merely opening the case could damage the microphone?
I realized at one point that the LED flashlight that I would use to prop up the screen from the case had a magnet on the bottom. Did that come into contact with the microphone and damage it?
I tried and tried and tried to find a solution, but could find none. So, I had to give back the computer with no working microphone and apologise profusely and promise to keep looking.
This happened last year. And again this year. And then with an iMac that a client let me keep since they had moved to a MacBook Pro. I was getting to the point that I was nervous whenever someone called me with an iMac problem, just in case I had to replace the disk.
Well, it happened again. But, this time, I was paying attention. Before doing any work, I turned it on, using my own boot disk, logged in and verified that the internal microphone did work. Check.
I went through the repair: turn it off, unplug everything, carefully disassemble the iMac, replace the hard disk, re-assemble, boot (“standard Apple chime” – yay!), install Mac OS X (while waiting, I put little labels with the client’s name on the old disk and on the top of the iMac), log-in, test the webcam and microphone, and ….no sound. Same damn result.
But…. I was so careful! I painstakingly went over every step. Took it apart again. Confirmed that the cables that I touched/detached were 1) not related to the microphone and 2) reattached. I look closer at the webcam/microphone assembly. Found out they were separate. I removed the webcam assembly and saw the microphone attached behind it. A little round metal piece firmly secured to the top and with two thin wires snaking around and behind other bigger devices in the iMac case. In other words, in order to damage this, you’d really have to make an effort. Which left me really dumbfounded.
I’m not sure why I did it, but I looked up the original (“Welcome to your new iMac”) documentation that Apple included with the iMac I was working on. I found it out there somewhere. The manual pointed very specifically to the various devices: iSight camera, iSight camera “On Air” indicator, ambient light sensor were behind the front panel. The microphone was on the top. Not facing the user, but facing up like the audio version of a Hollywood Klieg light. So, I looked there, to see what I could see.
I saw the little label that I had affixed there to identify whose computer it was, but…. I had put it dead center. Right on top of the microphone. I let out a barbaric yawp and wondered if it could really be this simple. Surely, a little piece of tape would not block the microphone so completely and utterly….would it?
Yes, it did.
I removed the label, turned on the computer, and the microphone was perfect. I did the same on my iMac and its microphone works great, too. Still waiting to hear back from the two clients I had left hanging. But, I’m sure that’s all it is.
If you are dealing with a similar problem with the microphone, please check to make sure that there is no tape, sticky-note, or anything else on the top of the iMac case blocking the microphone. You should be able to easily see where the microphone is.