My Core 2 Duo iMac Makes a wierd Noise and odd Ram Availability.

I Bought this iMac from mac connection.
A 17inch 2GHz Core 2 Duo.
The first one I returned because of dead pixels.
The Second one, Which Iuse has been great. But for the Past Month, I noticed a weird clicking noise from the speakers. I tried wiping out the HD and reinstalling the OS, I checked the Ram, I performed maintenence progrmas I have, different set of external speakes, headphones, I only can reduce the sound of it if I max out the Volume on the computer.
I would make a light click noise If I opened front row, opened a program, Booting up before coming to the desktop. I would make one click each time anyone of those things opened. ((((Allmost like a click sound of Static)))))))
I love the computer overall but this is an annoyance and I fear something could be wrong with the sound card. I don't know if an update to the drivers or future firmwire update would do anything.
Anyone have an idea??
I do't beleive I can return it to Mac Connection since I'm onto my second iMac with them, any issues, I have to work with apple now.
It also does the noice whn I adjust the Volume, Almost like static. I fear of a faulty sound card for some reason.
Before, It used to show out of the 1GB of Ram, that there were 820 plus to 750.
Right now, I only have Mspace running, Thispage, and iTunes And Theres only 186 Mbs of ram left free. Is the Ram Zapped or what.
On the iStat pro Widget. It shows 177 MB Free Active and 844MB used.
I worried about this

I do now about the the Use of Virtual Ram via Hard Drive. I did learn that The Ram still stays pending to open progams faster.
But see this. When I first Bout this computer, I would have abbout 750 to over 800+ MB free. Last 4 weeks, I still have the same programs installed and Now I start up with 620MB. Sometimes having iTunes open, This web page, my amail page, iPhoto, I Ram availability goies as low is 62 MB which is very low, considering having 1GB of Ram.
I see you have a similar iMac as I do, If you have a ram monitor widget. How much ram does your system start out with.
First Few Weeks it would have about 800MB, Now, ever sinnce I discovered that clicking noise out of the speakers when I nagigate the apps, thats wh I discovered the system starting with 620MB. I don't have different programs from before.
I don't feel good about this that with so few programs, even having light weight programs running, so much ram is used.
Just like Right now. I only have this page running, I only have 288 MB free. I understand what you said but I don't beleive so much ram should be out of place like that with this amount of ram.
Heck Even my 12 1.2GHZ iBook G4 with 768MB has more free ram with the same running apps.
Does anyone have any idea of my clicking problem?

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