4
General
You selected a DDR4-Generation module in the implementation of SO-DIM which is both matching.
But I am not quite sure about the frequency. DDR4 has two standard frequencies: 2400 and 2666 MHz. Normally 2400 is always supported as default, and the 2666 is optional for higher performance.
However Apple is saying you should use a 2666 MHz for the iMac ...
1
The RAM does appear to be counterfeit as far as I can see.
I have that type of genuine Crucial memory (CT102464BF186D.C16FN) here - but it doesn't look like your picture.
The PCB is almost identical, but some markings on it are off. The number of components mounted at the top of the board are very much different. The actual DRAM IC on my memory has FPGA ...
1
Apple lists the iMac memory specifications at this page which will help you with a more general answer than just lots of yes/no questions.
Also, when shopping consider how helpful the seller is - most will want to be sure they sell you something appropriate instead of leaving you it figure out everything by dumping a mass of parts and hoping you can do the ...
1
I’m assuming you have a bootable Windows 10 pen drive with Mac drivers.
I didn’t read any tutorials for doing it, the following is what I would try given your circumstances (and considering I’ve already installed Windows a few times on a few different Macs for gaming).
I would try to go on with the Bootcamp Assistant even though it says Windows 8, follow ...
1
If you haven't already try resetting the SMC and the NVRAM (PRAM) on your device.
Next try booting into safe mode (safe boot) and then try to restart the Mac afterwards and see if that helps.
Safe mode (sometimes called safe boot) is a way to start up your Mac
so that it performs certain checks and prevents some software from
automatically loading ...
1
Is the iMac an older model with a hard disk instead of an SSD? It takes a while for hard drives to 'spin up' compared to an SSD in a newer MacBook Pro.
1
Here are some solutions found on this Link
1) Check the Internet connection on your devices, As you may know, a
stable network connection on your iOS device and Mac is required to
upload photos to iCloud. Thus, you need to make sure the Wi-Fi network
connection works properly on your Mac and your iPhone (or other iOS
devices). If you find Wi-Fi ...
1
Have you tried all the steps recommended by Apple?
Use Target Display Mode
Follow these steps to start using your iMac as a display:
Make sure that your iMac is turned on, and the other Mac is logged in to a macOS user account.
Connect the Mini DisplayPort or Thunderbolt cable between the two computers.
Press Command-F2 on the keyboard of ...
1
Short answer
Yes, you can swap the 2GB Radeon HD 6970M for the 1Gb version and will probably not even notice the difference (depending on what you're using your iMac for).
Long answer
Since you're comfortable enough fixing your own iMac, and you'd have to get to the GPU anyway to replace it, I wouldn't replace the GPU at all. Instead I'd try fixing it by ...
1
It's not possible.
From OSXDaily Where’s the Startup Boot Sound on New iMac & MacBook Pro?
One theory promoted online and originating from some web forums was
that you could re-enable the Mac startup chime sound effect by turning
to the command line. The claim was that by launching Terminal app and
entering the following command syntax:
sudo ...
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