Hal, I have done ALL that you listed since the day I received my machine 3 years ago because it was having issues upon arrival but Apple did not replace it. I mentioned about it being DOA and it should have been replaced immediately and the response was the machine I had was a replacement for a DOA machine they sent me a week earlier (same make, model, configuration, all of which were non standard they were special configurations). All I could respond with was there is obviously some serious issues going on to get two DOA's in a row in less than a months time. Ultimately I was stuck with a DOA machine because a week prior the machine I bought was also a DOA. I did however work around it for nearly 2 years before the machine just plain would not work.
I had Apple Care and after they replaced the logic board 3 times, the optical drive 3 times, 4 if you count when I received the machine brand new, all wiring and cables have been replaced two and three times depending on the wires/cables we are talking about, the airport was replaced 3 times, and the list goes on.
It STILL does not work and I still had Apple Care however Apple refused to honor it. The issue does not show up on hardware test, not even when the USB had no power on the new logic board and I sent it back in. They called from the depot telling me they could not reproduce the issues. I asked if they plugged anything into the USB port next to the mini display port and he said no we only run stress test, which does not show up many hardware issues. I asked him to humor me and plug something into the USB port and the next day I received the machine with a new logic board because there was no power to the USB port. Unfortunately the machine still had the graphics issues, shut itself off, airport dropped off, over heating and causing kernel panics so I called to have it sent in again. This was the 4th time in 3 months and the machine was sent back saying they could not reproduce the issues two days later. I then received a call from a white glove manager who identified himself and asked if I knew why they did not do anything to my machine. I replied, yes, it passed the hardware test and the extra white glove hardware stress test. I added we all know there is an issue and we also know the software test for this issue does not show up in the hardware stress tests, however if they opened the machine or actually worked on it then they would see the problems just as they did the previous 3 times it was sent in. The cables were melted and I have the sheet from the depot stating that. The guy said my condolences and hung up on me.
I am in the music, entertainment, and photography industry and lost a few clients, lots of money, my reputation was marred until the issue became so predominant that anyone in the industry that hasn't already moved to Windows became aware of this issue. All this was extremely stressful, I lost just about everything even though I jumped through every hoop Apple requested. I reinstalled the OS so many times in the last 3 years I lost count. I even formatted the time machine backup drive losing EVERYTHING so Apple couldn't say that I must have brought something over from the backup drive. I did the reset of PRAM and all the other standard hoops one must jump through, I did the capture test with the software they sent me, blah blah blah. Problem is even that capture test does not show up the actual issue which leaves them clueless or deny there is an issue at all. I went through this for 3 years with the last 5 months prior to my Apple Care running out being so stressful I had a stroke after speaking to one of the people that called me either in the White Glove department (the manager and the one who said "my condolences"), or it was Tim Cooks assistant, I have to go through my files to see which one it was. I have built a huge 3 year file on this and everything I did, all the phone calls, all the times it was sent in, the date and times since they record the conversations because I am NOT sitting down quietly.
I have every post I ever posted as well as every post anyone else has posted and Apple does not allow "Freedom Of Speech" our first amendment right, the website that is a collaboration between myself and some very heavy hitters in the music/entertainment/photography industries there will be freedom of speech.
So I have done all the things you stated in your post and it got me nowhere, well it got me a stroke and an expensive paper weight that Apple refused to honor the Apple Care in the last 3 months. I did everything to resolve this in a professional manner but its obvious Apple has no desire to do so. I have alerted Apple of bugs and how to fix them for years, did I get credit? No! Don't really care about that because I have so much computer engineering credits to my name I could care a less about Apple's except when it interferes with my job, my money, my reputation, my health, and my customers.
I have written 100's of posts yet I am at level 0 and zero points which if sucking up and being condescending is what it takes to get points and move up a level then where I am is fine with me because I have plenty of credits where it counts. There is no doubt this will be deleted on THIS forum however there is a website where everything is to be displayed showing the wide spread global issue with the early 2011 Macbook Pro and the iMac's of the same time and same configuration have the same issues. The gull Apple has to charge customers to replace the logic board knowing full well it will go bad just outside the warranty of the replaced board. The fact Apple STILL refuses to acknowledge there is even an issue is an abomination.
Wake up Apple.... Steve can't come back and save you this time and there isn't another Steve Jobs standing on the street corner, visionaries like Steve are rare, normally die young, and the empires they built suffer for the sake of the all mighty dollar.