OK that is a pretty thorough and excellent response. I feel that I need to elaborate on my situation in order as your opinion on another more specific question.
First let me say that I'm talking of a 2011 imac which originally had a bto option of an ssd in addition to the already installed hdd.
So I did not replace the hdd with an sdd, the hdd remained and the sdd was plugged into a spare sata port that was already on the logic board. It's a pretty common thing to do as it is not very difficult. It all went very smoothly and everything was fine. Boot up in less than 20 secs. I elected to keep the two drives separate rather than create a single fusion drive.
Then after using the computer for about a month or more with not the slightest indication of any problem, the computer refused to boot up one day.
Everything would be fine up until the grey screen with the spinning wheel which usually is there for a few seconds. It just stayed at that spot.
I did all the usual checks and all was good. Booted up into single user mode and ran the diskutil operations and it reported back all was fine, no indication of any thing wrong in the boot up procedure either.
The behaviour was the same when booting from my bootable drive, ie stopped at the spinning cog on the grey screen. So I knew it was not the ssd which had the OS on it. It would not boot into internet recovery, although it would spend 10 minutes downloading it and then stop at the grey screen.
I spoke to apple on the phone and told them that I had added an ssd and we tried all the usual stuff which I have already detailed. They told me to take it to an apple store which I did.
When it was finally on the bench I told the technician that I had put in an ssd in addition to the hdd, which he could see when he went to conned it to the shop system I told him that it refused to boot up and he tried to boot into it with one of their repair partitions and it behaved the same way. He then booted into a volume that contained an apple diagnostic set of tools and ran the suite. It still used OS9 style windows which was cute.
I could see that there was an icon for each component and as it ran through the suite each icon had a big green tick through it except for the ram because as he said it was not apple ram and it would always fail. So he took the computer backstage to check the ram and came back and said he replaced the ram with known good ram and the problem persisted therefore it was not the ram.
It was from this point on that things started to get a bit weird. You see they had already been working on it under warranty in the knowledge that I had added an ssd and no one mentioned that it might be a problem, and then he suddenly says that they won't repair it because the warranty is voided. I presume that he was told this while backstage as he seemed like he was told to say it. He wanted to argue the point a bit and I asked to speak to the manager.
When the store manager came out I could see straight away by his body language, slight smirk and cocked head that I was not going to have a good time talking to this person.
Let me set the scene, when the computer suddenly stopped it just so happened to be right before my flatmate was about to depart to the country for a week and was handily able to give me a lift to the Apple store which I would be unable to get to otherwise as it is 45 minutes away by car and very difficult to get to by public transport.
Also there was a tropical hurricane that was causing a bit of foul whether the past week and there were floods and general chaos all down the east coast.
He dropped me off in the parking lot and I carried the 27" imac in it's box to the other end of the mall where the shop was. This was not easy to do. When the technician was telling me that the warranty was voided I had been in the shop for about 45 minutes and by now it was past their street closing time and it was a dark and stormy night it was pissing down raining and it was already going to be a long 90 journey on the bus home.
From my point of view I am in the store my computer is not working and it needs to be fixed. Under warranty not under warranty whatever, it needs to be repaired.
Now the manager tells me that the warranty is voided and that I should leave the store with my computer. I explain to him that I do not feel that the warranty is voided and that I'll need to take this up with the office of fair trading to get them to arbitrate in this issue because this is really one for the lawyers.
At this point you'd expect a normal person to simply say, realising that it needs to be repaired, 'OK we'll have a look at it and see what the problem it', then it can be handed upstairs for someone more qualified to make a decision.
But he is going to have none of this, he tells me that I have to take my computer out of the store, I say that I can't take it home, he says why? I say because I got a lift here and it raining and there is no way that I am able to take this computer to the bus stop in the rain much less get it on the bus.
He says...wait for it...'well you can't leave it here.
Now I just said I can't take it home and I meant it. I didn't mean I won't take it home because I'm being belligerent, I meant I CAN'T take it home. But he say 'you can't leave it here'.
Digest that for a moment. I said, well what are you going to do put it out on the street because I can't take it home. After thinking about it for a while he decides that he is going to make an exception in this case and allow me to leave it here for between 3 and 5 days, (and makes me sign an agreement to do this).
As I'm about to leave he tells me that 'you can't leave the box here'. I say why not, he says because they don't have any room. It's getting a bit silly now, I tell him I'm not taking the box home and he says well I can't guarantee it will be here when you get back.
Why the computer can't be put back inside the box, I don't understand but it's pretty clear that he's just being very unpleasant and deliberately so. Then we moved into Monty Python territory because a part of his brain must have still been wondering about me saying that I can't take it home due to not having any way to get it home, when he suddenly burst out with what he must have thought was a brilliantly deduced flaw in my argument.
He said, regarding me not being able to take it home, "what if we had fixed it then", I said what do you mean, he said, when we had it on the bench what if we were able to fix it? What would I have done then?
Well I said, I still wouldn't have been able to take it home, what's your point.
Roll that one around in your brain for a while.
When I related that part of the story to the senior apple technician whom I spoke to a few days later, he burst out laughing.
A few days later I got an email to tell me my computer is ready to pick up. I wrote them an email asking if that means they repaired it or what. I explained that it needs to be repaired, under warranty or not under warranty whatever but I'm not collecting it otherwise.
I eventually get a message that another sort admin person want to talk to me to 'resolve' this matter. I knew that if I spoke to them on the phone that I was just going to get more abuse so instead I wrote an email asking her to explain to me what her suggested 'resolution' might be.
It was then that I simply received another email telling me to collect my mac with no reference at all about my previous suggestion that it needs to be repaired.
By now I'd had enough of this BS and sent another email simply saying that I am now requesting a PAID FOR quote for a diagnostic and repair.
So I have completely bypassed the warranty issue, my thought was that I'd just take it elsewhere to get it repaired under warranty depending what the problem was so I was prepared to pay for a quote.
She wanted me to get the computer out of their store so I gave her a simple yes or no ultimatum. Will they give me a PAID FOR not under warranty quote for repair. Yes, or No.
Of course she wanted to say 'no' but she dare not write that down. There is no reason not to say 'yes' because I'm just asking for a paid for quote. But she does not want to say 'yes'.
Two days later I get a call from someone more senior who is not at the store. He immediately begins by mentioning the word 'warranty'. I cut him off and said it's not about that any longer, if he looks at the correspondence he will see that I simply asked for a paid for quote. Will they do it, yes or no.
I explained to him that it was only at that point that they sent it upstairs to him. In the end he decides that what they are going to do is to repair it under warranty.
I said to him that all I am demanding at this stage is a paid for quote, if he wants to offer to repair it under warranty then I suppose that is the least they could do.
Now while I am typing this up, I get a call from the senior technician to explain what is happening. I've just got off the phone. This is the story now.
Apparently it is all fixed and they have removed the drive because it was the drive that was causing the problem. Then when I ask for more details it turns out that it was not the drive that was causing the problem because they couldn't get it to work without the drive, but when they finally got it working, when they connected the drive it would not boot up again.
So they say. This sounds like BS to me and when I asked for further information he says he has the whole printout in front of him and that the problem has to do with the ALS cord. I say, 'you mean the ambient light sensor'? He says yes. Somehow my SSD makes the ambient light sensor cable not allow the computer to boot up.
I say to him that this sounds like nonsense. He then tell me that there's also a problem with the BT cable. I ask what the BT cable is, he says he doesn't know.
I say what do you mean you don't know you're a senior technician, then he says maybe they meant to say the BL cable. What's that I ask, he says 'a back light cable'.
Now I say so what is the story, well he says they have removed the SSD and it's all working again. Which means they have wiped my HDD which doesn't matter as it's all backed up.
So I tell him that it sounds like they have simply removed to SSD in order to be ratbags and fabricated some utter tosh about the SSD via the ALS cable is causing the problem. I'm not a technician but I'd bet the ranch that this is patent garbage.
Not only that but they still are trying to maintain that my warranty is voided. Yes this is what it's like dealing with apple geniuses in Australia, not much fun.