Macbook Pro Audio line in stopped working after Leopard install

Same problem here, but on 10.4.10 on a Macbook Pro C2D 2,33GHz. Tried a Plantronics headset for Skype, sent it back because I thought it was defective. Now I received a Sennheiser PC 141, and the same problem occurs : non signal via Line In, on the Macbook Pro AND the Mac Pro!

Message was edited by: giuseppebergman

I have exactly the same problem. I have been on the phone with tech support twice and even given my Macbook Pro to the Apple Store in Sydney to have the relevant part replaced, but no luck. My $50 Plantronics Skype headset has been working fine for the past eight months - but then a week ago, caput! Has anyone made any progress on this? I suspect it's a software issue, but am not sure where to begin ...

Same problem, have mbp 2.4 ghz, upgraded to leopard and mic stopped working, wierdly it also stopped working in XP through bootcamp at the same time.

Has Apple not admitted this is an issue and resolved it?

Hey, I just got my MacBook Pro about a week ago (the new MacBook pro), and it has the same problem - right out of the box. It's not my headsets (I have 2, and they both work fine on my old PC). I find it very difficult to believe someone from Apple hasn't issued an acknowledgement or come up with a solution for this. It's a pretty big deal, and evidently it's not an isolated incident.

The microphones in my headsets are dynamic (i/e they don't need phantom power. They work fine plugged directly into my old Windows laptop).

My MBP came with 10.5.5 installed, and all of the latest patches are now installed.

Anyone have any ideas on how to fix this yet?

I also have this problem. I usually use my bluetooth to talk to skype, but i just bought this voice recognition software and tried using the Line-In with a better mic...and nothing! I thought the mic was defected, so got a new one with the same result.

Reading this discussion tells me that I'm not the only one. I use Vmware and when I tested the internal microphone is very chopy and slow, not sure if you guys have the same experience using it with other OS.

Errr..this is frustrating.

I found one solution and apparently the Audio Line in port requires some sort of power it does not work from a passive direct analog input. I discover this by plugging an stereo phone line cable with both male ends from my ipod to the audio line in (external Microphone hole) and it finally detects sound. (one quick way to test it if the hardware itself is not the problem)

My solution was to buy an USB microphone headset rather than the old classic headset that comes with a mic and headset phone cable, it was like 30$ on ebay. It works now, both in my Leopard and VMware XP OS systems.

Look like I found solution to this problem.
Go to Utilities, Open Audio MIDI Setup, Under Audio Devices look down to lower panel Check Thru button.
That worked for me.
Good Luck.

The Thru box is grayed thus unclickable on my Mac... It still doesn't work...

The other solution with the aggregated device doesn't work either... Did it work for someone?

Message was edited by: Etienne Lehoux-Jobin

I have a 2 year old Mac Book Pro with 10.5.6. I have been using Line-in successfully for over a year, then it just stopped working last week and has not worked since. As I had a few other issues, I did the complete Erase hard drive and re-installed everything (store bought Leopard, then updates) - still no line in. The headset is fine as it works no problem on a Windows PC. The built in microphone also works fine.

I assume that it is a software problem after reading this and other forums but is there a solution that works!!! None that have been mentioned on this forum seem to work.

My workaround is to use a USB headset but that is not good enough as I also use line in from my dictaphone.

Stevesub

I have just had a long chat with Apple support in Australia where I live.

Apparently the Line-in is port is for high level inputs ie directly from an amplifier. It is not designed for headsets. I have a G5 and MacBook Pro both with the same problem.

I put a high level amplified signal into the Line-in port on my Macbook Pro and it worked no problems.

The answer to my problems is now solved by using a USB headset. You can buy USB sound cards for a few dollars on eBay but I am still waiting for one to arrive so I can go back to using my expensive Plantronics head set.

From my discussions with Apple support, they are going to be doing nothing as they do not see that there is a problem so we all have to get "work arounds" (ie USB head sets) to solve the problem as Apple will not be doing anything in the short term.

Stevesub

Same exact problem. It used to work fine on my macbook pro and all of sudden my mic no longer worked. Don't remember if it was after an update. At first I thought my headset was broken, but it works fine on my windows pc.