Level 1

31 points

MacBook Pro: Electrical "Hissing" sound

My MacBook Pro is making a terrible hissing sound.
It's coming from under the keyboard, seems to be all over under the keyboard.
It sounds to me like it's a power regulator issue. The only was I can get it to stop is by using the Processor panel and turn off CPU2. As soon as I disable CPU2, the sound goes away. Turning CPU2 back on causes the hissing to return.

Is this a defective notebook, or is this "by design"?

Thank you

MacBook Pro 15" 2.0GHz, Mac OS X (10.4), 2GB Ram, 100GB 7200RPM HDD

Posted on Mar 2, 2006 9:10 PM

59 replies

Bopchops

Level 1

5 points

Mar 13, 2006 9:51 PM in response to Transeau

Thanks,
I have the 1.83 MBP with the 7200 drive, and 2 GB memory. I do not have the whine but the fan does operate almost constantly. Hope this helps.

Mar 13, 2006 11:16 PM in response to Transeau

this link/article should help.

http://www.red-sweater.com/blog/105/all-work-and-no-play-makes-a-very-quiet-macb ook-pro

Sachin

Level 1

0 points

Mar 14, 2006 11:06 PM in response to Transeau

im no computer expert so i gotta ask. What the reasoning behind disabling/enabling etc the processors??

Transeau Author

Level 1

31 points

Mar 15, 2006 7:42 AM in response to Sachin

the simple explination is that for some people, it stops the notebook from making the headache inducing whining sound.

Gilbeau

Level 1

0 points

Mar 17, 2006 8:23 AM in response to Transeau

Do you think sending a letter is required? Couldn't I just place a service request?

MBP 2.0 GHz Mac OS X (10.4.5)

Transeau Author

Level 1

31 points

Apr 19, 2006 9:45 PM in response to bayb735

Good luck with that. I'm on my 3rd MPB. This one if from the 3rd batch - still hisses.

Apr 19, 2006 10:28 PM in response to Perturbed

Well, let's say for the sake of discussion that observation has some basis in fact. What do you suggest might explain it?

Randall Schulz

Apr 19, 2006 11:05 PM in response to Perturbed

For it to be induction, you have to state a hypothesis. Please do.

RRS

Shaddow

Level 1

10 points

Apr 20, 2006 6:22 PM in response to Transeau

I ordered from amazon and have it. You'll probably find that the percentage of people complaining about it matches the percentage of people who ordered directly from apple (ie: most)

moe-man

Level 1

0 points

Apr 28, 2006 3:39 PM in response to Transeau

I would half agree with you. My thought is that the actual activation of the i-sight camera draws more power and stops the hiss. Similarly, some users report that a HDD spin up also stops the hiss.

Jun 23, 2006 7:11 PM in response to Transeau

I have the same issue. I don't care why or how. I want it fixed!

robyoung

Level 1

0 points

Jul 31, 2006 6:40 AM in response to Mark A. Daniels

Just got my Macbook Pro back and the Logic Board has been replaced, it's now silent. Completely! I can't hear the whine at all! Thumbs up here and I'm happy!

Sep 1, 2006 2:59 AM in response to Transeau

Shipped my macbook pro to apple today to fix this whining issue. I hope they'll fix that annoying sound. I'll keep you guys updated.

Sep 8, 2006 2:51 AM in response to Vinyl4bpm

Just got it this week. No more whine. 🙂

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MacBook Pro: Electrical "Hissing" sound