27-inch iMac Graphics Firmware Update

I've received 2 faulty 27″ iMac's since November 2009. I noticed the flickering on the first machine almost immediately and ordered a replacement. And the replacement turned up with exactly the same problem. I installed this Firmware update and it did absolutely nothing to remedy the problem. And I'm still having constant flickering and screen going black. I'm now waiting on a third machine. So fingers crossed it won't flicker or I'll have to return it for a full refund. Not going to try for a 4th machine!

Yes. I haven't had any display problems, but applied the patch anyway, without any difficulty. Let's hope this solves problems for a lot of people (but because of this problem there will be a lot of nice buys at the Refurb Store after the holidays!!).