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Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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Making iMac headless. iMac GPU & CPU issues

Hey Guys,

There are a couple posts on this but not conclusive to my situation so thought I would ask this anyway.

So I am using conferencing software called Zoom Rooms that would normally be setup on a limbless/headless Mac Mini with a projector as display for conferencing.

I have an iMac 27” with broken screen which can serve this purpose since it cannot be used for much else but, even with mirroring options enforced on the display settings the software it’s self recognizes 2 displays - the broken screen & projector, so that unfortunately participants cannot be seen on the projector.

There is a workaround in the software but it has to be manually set every time a meeting is started. I have tried disconnecting the iMac screen internally but what seems to happen is it uses the CPU for displaying to the projector and not the GPU causing the fan to go crazy and visuals and performance to be jittery and sluggish.

Is there a work-around for this issue?

I saw a post about a VGA hack using resistors but not sure if that would work due to the projector already using a display port > HDMI output.

I can see that a Mac Mini would not run into this issue due to it being designed to only use an external display via GPU and iMac’s quite the opposite.

Any info on this strange attempt at using a half dead mac would be greatly appreciated.

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Sadly, I don't think there is a solution here. You are facing a problem on who is active first. The internal will always be the primary display.

While it’s not ideal have your thought on getting the display issue fixed and/or look at selling it to get another Mac Mini?

Can you fill us in on what’s wrong with the display, maybe it won’t be too costly to repair.

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The problem you are having is with the temperature sensor cable for the broken screen. When the screen is detached, the sensor port on the logic board registers a problem and in response the fans power to maximum and the system slows to a crawl. If you detach the sensor pad from the back of the broken monitor and adhere it to something like an installed metal hard drive case (leaving the other end plugged into its logic board port), the system will register temperate feedback - hopefully within the accepted heat range - and your headless iMac should work perfectly.

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Perhaps I can shed light on the inevitable question of “why” that follows every technical inquiry. I’m hoping to use mine headless as well, since I spent about $4500 on it and without spending $20,000, it’s the most powerful machine they made capable of running both windows and Mac back to OS Mojave, which it does perfectly. It’s the most useful computer I’ve ever owned. …except that as nice as the 5k display is, I work all day on a 45” curved LG and coming from that, I’m squinting at the 27 & have no way to fit both displays on my desk. A Mac mini would be a huge step down. In a perfect world I’d just turn off the iMacs display and set the LG as the primary and only active display, driven by the powerful gpu, but OS X provides no way to do it. …which is funny because if I want to work solely in Windows, I can boot into that and do exactly that no problem. But then it’s goodbye OS X completely. SwitchResX etc will dim it but not turn it off. The longer this big resource-heavy 5k display runs on this thing, the closer it gets to burning up the gpu, so this may also prolong the boards lifecycle, which would be great.

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@yukwa4mgygwqaoh - First off the 5k display won’t wear your GPU, it’s what the application requires that could cause the GPU to fail, but that’s not a size issue it’s the scan rate being used. Lowering the rate will reduce the load on the GPU.

Think how a car’s engine idling is not going to cause car to over heat but driving up a sizable mountain or fast race track will press the engine hard. Your system is no different.

While I do get the desire, force fitting your iMac into a different expected use case it was not designed to do as you’ve already made the investment and want a different type of display.

Frankly I would sell the system and pick up a Mac Studio system right now they are heavily discounted as Apple needs to clear the shelves with the pending next version. If you’re iMac is more that powerful for your needs, then jumping to a Studio will who’re than exceed your needs! Then you can plug in your curved display and run a few different OS’s on it.

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I didn’t mean I expect the gpu will just fail driving the 5k alone, but driving the 45” LG plus another 5k display besides. Now your car analogy is towing a second car up that mountain 100% of the time, when it’s not needed really ever.

The question at hand is whether Mac OS still prevents detaching the display indefinitely. People have done it with success back in the Mojave era only to find that after a few reboots the OS wouldn’t boot again until it was reattached.

No one was asking for a random shopping recommendation here. The solution to this very specific technical question is not “buy a totally different kind of computer that’s not compatible with your software at all.” A Studio or any ARM Mac is as useless as a high speed wristwatch here. Aside from CAD & PLM systems, which only run on Intel, the only remaining computer needs are basic admin that can just as easily be done on any old iPad +/- keyboard at this point. Once these iMacs go, it’s goodbye Apple.

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