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zoran

macrumors 601
Original poster
Jun 30, 2005
4,790
132
Is it possible to install HSierra on a drive thats in an external case and then install that drive to a 2010 iMac making it the iMacs startup drive? The only computer that can help me with this task is a MBPro.
Since my iMac has no drive, i was thinking to making one with HSierra on it to be ready to boot.
 

DeltaMac

macrumors G5
Jul 30, 2003
13,754
4,579
Delaware
What year MBPro do you have?
If it supports High Sierra, then, yes, you can install High Sierra, using your MBPro with your new drive in an external case. All you need to do is point the install to your external drive. (Prep the external drive first, by formatting a new drive as GUID, with macOS Extended (journaled) as the format. The High Sierra installer will automatically change the format to APFS, as a normal part of the system install.
When the install is complete, move the drive to the internal slot on the 2010 iMac, and try to boot from that...
You could make an attempt as an external drive to boot the iMac, but, I think, the best test is to boot from the internal SATA port

I continue to recommend that it would be a Good Idea™ to replace (or at least test) the button battery, as that can be possible source of the occasional weird issue. Big job when you have to remove the logic board just to get at the battery, but would be one more thing to check off in the list of items that might cause boot issues.

** regardless of the opinions of a few others here, I totally enjoy "revitalizing" those (now) older Macs. In fact, I have a 2010 iMac that I use as a dedicated system with some software that will clear passwords, and do other hardware checks on used (android) phones of various brands. (not everything done on a Mac is about Apple :cool: , but my now-old iMac continues to do what I ask of it.)
 
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zoran

macrumors 601
Original poster
Jun 30, 2005
4,790
132
Its an M1 MBpro and a mid2010 iMac.
Leaving aside the opinions of those "few others" i love that machine too and i cannot just chuck it in the bin :)
If its a failed button battery would it make a continuous chime, as if its begining to boot but cant actually boot?
 

zoran

macrumors 601
Original poster
Jun 30, 2005
4,790
132
Is there anyone with a working 27” 2009-2011 iMac that can unplug the power from the HardDrive(or SSD) and see when starting the iMac he hears a chiming sound and then a beep and all this happens again and again.
 

Hazima

macrumors newbie
Nov 13, 2024
1
1
Hey, same situation here. I was given a free mid 2010 27” EMC 2390, without disk as well. But mine doesn’t boot all all. I wonder if it’s the battery. Do let me know if you have fixed it, that would give me some insights!
 
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DeltaMac

macrumors G5
Jul 30, 2003
13,754
4,579
Delaware
When you say it doesn't boot - does anything happen? Does the screen light up? Try this with dim, or no lights in the room, just to watch for ANY light from the screen. You should hear some noise at power on from the optical drive, as that does a power reset when your Mac is first turned on. Also, try plugging a USB device/external drive into one of the USB ports, to check if that device shows any power (most devices will have some kind of power indication), or you can also try pressing the caps lock on the keyboard (if that is a wired USB keyboard, the caps lock should have a light, showing that caps lock is turned on.)

** first thing to try ** Flip that heavy iMac upside down (Be careful!) so the bottom vents are facing up. Plug the power cord in, and look into the bottom vents. You should see a lighted LED. It will be a few inches left of center Press and release the power button. You should see more LEDs light as the POST (Power ON Self Test) progresses. All 4 LEDs will remain lit up if the display and graphics card completes the power on test on a good system.


Finally, if the hard drive was removed before the iMac was disposed of, then it is also possible that other connectors were opened as well. A good next step would be to open up the iMac, and look for loose connections.
 
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