"I'm not neccessarily a Nvidia fan but you don't see this issue with anyone using the GF9400M......"

Seems the power requirements, as well as the performance, is considerably different between the 9400M (a mobile GPU) and the HD4850! My experience in this field screams PSU, cooling or both.

Guys, this is an issue with the ATI GPU not Apple. They have had similar issues w/ATI in the past. I'm not neccessarily a Nvidia fan but you don't see this issue with anyone using the GF9400M......

I can only guess they are waiting for new pc's from apple. ;-)

Heh, I actually built a similar site not even knowing this existed (until just before launch):

http://www.listenupsteve.com/fixtheimac/

Waiting on my 3rd replacement imac now, hopefully my last..

When you combine the i5 or i7 with the 4850 ati video card that can be too much for the power supply. I'm not sure if Apple uses the same power supply for all iMacs, but it would not surprise me.

IMO the i5/i7 iMacs are the best offering from the iMac family to date. I am no fanbot of Apple.

I just do not trust Apple anymore when it comes to quality hardware. They are taking too many short cuts.

IMO the i5/i7 iMac should be running with no less than a 650 watt power supply.

...some sort of better box packaging is needed?

That and maybe a more juicy powersupply?

I always wondered how good a PSU can be in such a small space.

thats why imacs suck.

What is it with fan boys and explanation marks?

I work for a large Apple reseller and we have sold over 200 of the 27inch imac's and only had 1 back with a line down the screen.

Apple will sold hundreds of thousands of these unit worldwide and the amount of people reporting faults is small 2-4 %

If this was a wide spread issue Apple would have issues a recall!!!!

Oh and the comments by scott Apple only take your credit card details if you are out of your 90 days phone support from purchase which is the same for every other PC manufacturer!!!!

And yes i know as i have worked in the IT support industry for nearly 16 years working for companies like HP, Toshiba etc

Just like it is wise not to buy a new OS until it is given a good run for bugs it is not wise to buy new hardware either, from anyone, even a new line of TVs should be given a good 6 months or so.

As I am a former mac owner Apple pretends there are no problems with there machines.
If you do call to report a problem the first thing they want is your credit card number.You would be better off to buy the computer of your choice and put osx on it. Its illegal but at least you get what you want without the premium.