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Apple Computing Products:
macOS - Operating System
Failing reinstall of El Capitan on formatted HD - no Disk Utility (2012 iMac, white screen of death)
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<blockquote data-quote="CrossyTM" data-source="post: 1874886" data-attributes="member: 406955"><p>Thank you very much for your contribution chscag!</p><p>Yes, indeed. Target Disk Mode enabled me to copy the files and create a disk image and to format the iMac HD. That works fine.</p><p>By now, I desparately copied back the disk image, for another attempt: Via Thunderbolt and Target Disk Mode, I'll try to install El Capitan on the iMac HD - In contrast to the Sierra installer which solely would let me select my MacBook Pro for installation, the El Capitan installer offers to select the iMac HD, but: (at least) when the iMac HD was formatted, the installer showed the iMac HD, but said "OS X can't be installed on this disk. macOS isn't installed" (same with the USB stick, of course). Hopefully, with the OS and everything reinstalled from the disk image, I can effectively select the iMac HD for installation of El Capitan... I shall report.</p><p>Interesting that the GPU might cause my problem... At least up to the point where the status bar under the Apple symbol at startup is filled to about 60%, the monitor & graphics work fine.</p><p></p><p>I had run the diagnostics a couple of times - I am not sure whether and to which extent the GPU is tested at that popint... But it showed no problem (except for once or twice, where a memory error (4MEM/62/40000000:…) had been found (allegedly?!), but that occured only once in like 8-10 dignostics runs, and I had furthermore rearranged the 4 memory modules in various ways; no reproducibility of the alleged memory error).</p><p></p><p>What I also did is let the iMac start in verbose mode (command-V at startup). I took photos from the screen to see whether I can infer something useful from the many outputted lines... but apparently, I don't have the background to properly understand and interpret all the stuff... (and some parts of it may be due to the formatted DH...) - Maybe I'll try again, now that the HD image is reinstalled.</p><p></p><p>Btw: In the meantime discovered a TimeMachine backup (from 2014...) and tried to reinstall that (HD via USB connected to iMac, hold Option key at startup, select the HD); but after the short lines running along a circle under the Apple symbol ran for some time, the blue screen of death showed up...</p><p>I don't know whether that might be related to the last OS X version I had installed on the iMac (which probably was High Sierra - I am not sure whether that might matter and how I could definitely find out which OS X version I had installed at the time of crash.</p></blockquote><p></p>
[QUOTE="CrossyTM, post: 1874886, member: 406955"] Thank you very much for your contribution chscag! Yes, indeed. Target Disk Mode enabled me to copy the files and create a disk image and to format the iMac HD. That works fine. By now, I desparately copied back the disk image, for another attempt: Via Thunderbolt and Target Disk Mode, I'll try to install El Capitan on the iMac HD - In contrast to the Sierra installer which solely would let me select my MacBook Pro for installation, the El Capitan installer offers to select the iMac HD, but: (at least) when the iMac HD was formatted, the installer showed the iMac HD, but said "OS X can't be installed on this disk. macOS isn't installed" (same with the USB stick, of course). Hopefully, with the OS and everything reinstalled from the disk image, I can effectively select the iMac HD for installation of El Capitan... I shall report. Interesting that the GPU might cause my problem... At least up to the point where the status bar under the Apple symbol at startup is filled to about 60%, the monitor & graphics work fine. I had run the diagnostics a couple of times - I am not sure whether and to which extent the GPU is tested at that popint... But it showed no problem (except for once or twice, where a memory error (4MEM/62/40000000:…) had been found (allegedly?!), but that occured only once in like 8-10 dignostics runs, and I had furthermore rearranged the 4 memory modules in various ways; no reproducibility of the alleged memory error). What I also did is let the iMac start in verbose mode (command-V at startup). I took photos from the screen to see whether I can infer something useful from the many outputted lines... but apparently, I don't have the background to properly understand and interpret all the stuff... (and some parts of it may be due to the formatted DH...) - Maybe I'll try again, now that the HD image is reinstalled. Btw: In the meantime discovered a TimeMachine backup (from 2014...) and tried to reinstall that (HD via USB connected to iMac, hold Option key at startup, select the HD); but after the short lines running along a circle under the Apple symbol ran for some time, the blue screen of death showed up... I don't know whether that might be related to the last OS X version I had installed on the iMac (which probably was High Sierra - I am not sure whether that might matter and how I could definitely find out which OS X version I had installed at the time of crash. [/QUOTE]
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Failing reinstall of El Capitan on formatted HD - no Disk Utility (2012 iMac, white screen of death)
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