27" iMac screen low frequency humming + moving too freely on the base

Got a new 27 incher on tuesday after fedex lost the first one That's a different story.
The problems
1. The huge iMac moves a tad bit too freely on its base and when i try to tilt it to an angle, it doesn't stay at that angle it trys to go tilt back down ... maybe its gravity.. i don't know...
2. Very very low frequency humming noise from the iMac top left corner... its out when it goes to sleep. not the normal HDD/fan noise. I have a fan app, its not the fan... but its really annoying when working on it ...
i've seen a couple of posts about this. i'm taking this 27 incher to the store tomorrow... lets see how the geniuses deal with it. i hope they acknowledge this problem. does anyone else with the 27" have this problem?

Took it to the apple store, some genuises looked at it, confirmed it and sent me another one

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I have just recently had this problem as well on my 24 inch iMac, though the evidence leading up to the problem wasn't as extreme. I didn't experience the screen going blank, things disappearing, or screen flashing pink, purple, grey etc.
I do however have an "image persistence" or burn-in issue. I leave a window open for as little as 5 minutes and when I move or close it a faint representation of that window remains burned into the screen. It seems to be most evident with high contrast websites, such as Google. When I leave the google home page up for a few minutes I will get a burned in Google logo on my background along with the address bar and a box the size of the window.
When I first noticed the problem I took it into the Apple store to have it checked out. The genius there listened to me patiently as I described the problem but wasn't sympathetic when he tried to replicate the problem by letting a window stay open for at most 30 seconds. He didn't say anything about not being able to see the problem himself but sent me home with a Work Authorization to replace the LCD panel. The store got in the 755 dollar part a couple of days later and I took my computer in again and they replaced the panel. They called me up a day later to pick up my "fixed" computer I took it home to test it out and the exact same problem was still there.
So I call up Applecare and explain what happened and told them how stupid it was that they sent me home with my computer and before verifying if they even fixed the problem. They agreed that it's a hardware problem and it's a possibility that it could be the logic board. They set me up with another appointment at the Apple store. So I take it in again and tell them that the display was replaced a week ago, and that it had the exact same issue as before. They get me to show them them problem again... this time he actually acknowledged that he saw burn in on my screen and told me that he will order in another LCD panel because the one they put in must have been faulty. I told him how ridiculous it was to replace the screen again because it seems very unlikely that the new display would have the exact same problem as the old one. I asked him what is going to happen when that comes back with the same problem and he didn't have a good answer.
So... instead of really addressing my problem this Apple store will have spent $1600, nearly the cost of a brand new 27 inch iMac, to not fix my problem. Had I not been protected by Applecare I wouldn't have been able to afford all of these replacements. Applecare should be built in to the cost of the computer. These computers NEED three year warrantees. I love it to death, and haven't had any other problems (knock on wood). But I'm an illustrator; I work almost exclusively with Photoshop doing colour and image quality sensitive things. I feel your pain man. I'll let you know the outcome of this. Who knows, maybe the genius was right and that the part they gave me was faulty and by coincidence it had the exact same problem as the one that shipped with my computer. But that leaves me to question the reliability and quality of the parts they are using.
I've been looking around on forums and there are a ton of different issues with this display. In fact you know if it comes up as a google suggestion when you search, there's a problem. Just type "+24" iMac d+" and Google will help you out by suggesting "+24" iMac display problems+". We're not alone.

27" iMac screen low frequency humming + moving too freely on the base

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