I really can't believe how many posters in this thread are defending Apple on this one or saying you can't jump to conclusions or you must give them the benefit of the doubt. It's easy, yes you can. He got a used keyboard!! That is total blindness and naivety on your part thinking Apple can do no wrong.
Getting a used keyboard on a new system especially systems that are as expensive as these for the hardware you get is inexcuseable. New is new, untouched unused!
Yes it is great that Apple does't have restocking fees, but in my opinion if they spent a little more on QC intstead of maximizing their profit margins by having these things manufactured as cheaply as they can, they would save a bunch of money in the long run. Sometimes you have to spend a little more in certain areas to maximize your profits.
You have to look at the price of all the returns. Apple care customer service time spent diagnosing problems, shipping costs and a multitude of other incurred costs inherent to defective products and the returns process. Then on top of that, include the amount of returns that occur sometimes when nothing may actually be wrong because of the rep the iMac is getting with problematic screens and such. People are worried and end up returning some machines that probably really don't exhitbit any problems. Also an incurred cost.
You have to face the facts that many iMac's are getting returned due to screen issues and other problems with QC. It's all because they are trying to manufacture so cheaply. (Granted that is what corporations do, however exhibit better control standards for your devices.) If many are getting returned for screens do something about it and execute a plan to rectify the problem.
Here is an idea, if they can spend millions on antenna testing facilities for iPhones then could put a few people in a room for .25 cents an hour or whatever they pay people in China to turn the lights off and look for yellow screens, excessive light bleeding and dead pixels. If I were Steve Jobs I would be outraged that there are so many returns on these systems when the problems are so easy to identify. Don't let those units out on the market. They hope that they get customers who don't notice or know any better. If they could pass of 25% of their bad panels they are happy with it instead of manufacturing new ones and eating the manufacturing cost and maintaining respect from their loyal customer base.
Yes the OS is great but most people who buy iMacs buy it for the display. No fool would drop that much money on an iMac for the hardware they give you. It's paltry. A $600 windows machine is as powerful as the $1699 baseline 27" Aside from certain software i really never understand why apple is the choice for many creative professionals if the same software is available on a PC. Once in the apps they operate the same, Mac's have always been very underpowered platforms. IT'S ALL ABOUT THE DISPLAY.
For those of you who are ready to jump my ass, please dont confuse the beauty of iMac's design and form factor with it's manufactured, and quality shortcomings lately.