I ordered an i7 iMac a month ago today. It's 10 days since I plugged it in and got nothing.
Looks like the planeload of i7 iMacs that went west from Shanghai suffered a heavy landing at some point going by the number of DOA and cracked screens people are finding.
I'm quite patient, but it's been a month. I was using my hackintosh but as you can read here, that's no longer possible.
I've created a personal account on my work MacBook and am using that; all my other computers have been sold or packed up for a move.