iMac without the hum?

I can verify that, although I've received 4 defective units, none of the 20 inch models (both Core Duo and Core 2 Duo) hummed when the brightness was adjusted. It's very probably yet another flaw in this product line.

I bought a 20" intel imac back in Feb, totally quiet. Recently upgraded to the new 24 incher - noticed the screen hum noise almost immediately. Annoying, especially after having a totally silent iMac.

From checking around the web and here it seems that this is only (or most commonly) found on the 24 inchers, not the 20 or 17. Then you've got to factor in the # of people who just have it but probably just don't notice it. I would return it but again from what I've read, it seems people have gotten replacements with the same hum more often than not. So my questions would be:

1. Does apple know about this issue? Sounds like every story about calling support results in the tech saying he/she has never heard of this and issuing a replacement. I don't doubt that I would get the same response if I called - I'd like to hear that Apple has been hearing more and more about this problem and are working on a fix. I'll probably call just to log the issue one more time in their database.

2. Is it hardware or software? Software I can live with, provided Apple acknowledges it and has a firmware fix in the works. To test whether it was something in the OS I loaded boot camp and messed around with the brightness in Windows, same hum - doesn't look good (or sound good that is).



imac intel Mac OS X (10.4.4)

no it's just not 24" i have a 20" intel duo not the new the new 2 duo and mine hums

My 20" Core 2 Duo is approximately 3 weeks old and no hum.

I've got the 24" and absolutely no hum or buzz. I even put my ear up close. 🙂

Does anyone have a new 17", 20" or 24" iMac that does
not hum when the brightness is adjusted?

Just about week old 24", totally quiet, no hum.

No hum at all on my 24".

My 24" makes almost no sound whatsoever (in fact it's quieter than my external hard drive). I guess you have a slightly defective unit.

I received it this week, incidentally. 🙂

I just recently purchased a 20" that has never hummed. I've had it for approximately 1 month and I am loving it, truly loving it. I had been strictly a windows pc user for like 20 years. I'm sooooo glad I made the switch. Sorry for ranting off topic, just had to put that in there.

what does the hum sound like because all i can here on mine is the fan blowing



is it like a sound you can make with your mouth

I have it, but i didn't think i did at first (24")

The fact is that it is very, very low. I didn't notice it because the fridge was making noise 3 rooms away, and that was enough to drown it out...even with my ear on the iMac's case.

So to the people that think you don't have it, i thought that too...you have to make sure there is *absolutely no* background noise to make a good assessment.