24" iMac Hum is Gone

I woke up today and my brightness was all the way up...i use my iMac with the brightness at its max setting all the time, but right after i wake up it's too bright.
My room is very quiet in the morning, and i noticed right away that there was no hum when i turned the brightness all the way down. The computer was on all night, just the display was sleeping, and my CPU is about 98-100 degrees F.
I wonder if it depends at all on the temperature? I am sure the hum will return, but for the last 10 minutes on the lowest brightness setting possible it's definitely not humming.

I woke up today and my brightness was all the way
up...i use my iMac with the brightness at its max
setting all the time, but right after i wake up it's
too bright.
My room is very quiet in the morning, and i noticed
right away that there was no hum when i turned the
brightness all the way down. The computer was on all
night, just the display was sleeping, and my CPU is
about 98-100 degrees F.
I wonder if it depends at all on the temperature? I
am sure the hum will return, but for the last 10
minutes on the lowest brightness setting possible
it's definitely not humming.
I have a similar machine and had this same problem. The hum was corrected by contacting Apple and then leaving the machine with the local service shop for about 10 days. The solution was drastic for a machine less than 3 weeks old - replacement of the display panel along with associated inverter. Strongly recommended that you contact Apple as if the hum points to an inverter problem at some point it is likely to cause other issues and then ...
This appears to be a problem that will not just go away and the before/after noise levels associated with display brightness changes are significant. My concern was what if there was a problem, caused by the inverter, outside of warranty then what would be the repair cost?
Intel iMac 2.33 GHz   Mac OS X (10.4.8)  

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