I got the whine even when power cord is connected!

This is my third day of using my new Macbook and today I noticed the whine! (I didn't notice it yesterday or the day beofre).
However, I have my Macbook plugged into the powercord at all times and yet I can hear it! And stranger, it seems like it comes from the left side of the touchpad.
That's not really consistent with what other people are reporting, is it?
But it goes away during CPU load and it's quite loud. Easy to hear over the fan noise of my stationary computer sitting under the desk.
Also, the plastic border which runs around the edge of the bottom of the Macbook has a 1mm gap on the left hand side (near the noise). Quite cheaply built, imo.
How do I check which week this unit was produced?
And do you think this is enough to call the Apple store?
I just got it (and actually need it next week on a trip) so I'm not sure I want to send it back right away. Can I wait with reporting this issue, and if so, for how long?

However, I have my Macbook plugged into the
powercord at all times and yet I can hear it!
And stranger, it seems like it comes from the
left side of the touchpad.
That's not really consistent with what other
people are reporting, is it?
It is the rantings of a few people who are insisting that all MacBook Pro CPU noises are the same across all units. The CPU noise is caused by a vibrating component on the logic board while the CPU cores are cycling on and off under the power management software. This causes a relatively regular frequency so when the component vibrates it can be audible. Because the vibration is coming from one or more components on the logic board, there is no simple answer to how or under what circumstances you will hear the noise.
Many MacBook Pros produce no audible noise at all. Some whine like crazy. The use with a power adapter or battery can affect the noise because it varies with the power management but there is no rule about when it will make noise.
Don't listen to people on these boards who insist that you are either deaf or lying when it comes to if or how your MacBook Pro is making noise. They refuse to listen to many reports that contradict their beliefs. Like you, my MacBook Pro makes a sound only when on AC power (it is faint but audible.) It is perfectly silent when on battery power.
MacBook Pro 2.16 1 GB 100 GB 7200 RPM Mac OS X (10.4.5) Mac mini 1.42 1 GB; PowerMac 450 MHz (Upgd. 1.2 GHz)

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I got the whine even when power cord is connected!

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