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<blockquote data-quote="CrossyTM" data-source="post: 1874887" data-attributes="member: 406955">Hi, Rod, thanks for your input.For the bootable installer I used the instructions from Apple and from Macworld, making use of the createinstallmedia command (in the terminal). After Option at startup, I have been able to select the USB stick. But no Disk Utility turned up (and no installation took place)... I don't know whether I still made some kind of mistake in this regard...As to the data backup: I did it by Target Disk Mode, as described in my other reply some minutes ago. I don't know whether this might be of interest, but- in the weeks before the crash, the iMac was very slow at times, and that seemed to be due to Firefox (way too many tabs in way too many windows...) (but more than 300 GB of the 1 TB of the HD is free...)- the crash occurred while being on an olmypus (camera) site in Firefox which was trying to show or install something (if I remember correctly...)- to me, the iMac seems to be heating up quite a lot; not sure whether that has always been the case or has started only in the weeks (or so?) before the crash, and that is still the case (but I don't know how warm / hot that iMac 2012 model shall / may be during operation.</blockquote>

[QUOTE="CrossyTM, post: 1874887, member: 406955"] Hi, Rod, thanks for your input. For the bootable installer I used the instructions from Apple and from Macworld, making use of the createinstallmedia command (in the terminal). After Option at startup, I have been able to select the USB stick. But no Disk Utility turned up (and no installation took place)... I don't know whether I still made some kind of mistake in this regard... As to the data backup: I did it by Target Disk Mode, as described in my other reply some minutes ago. I don't know whether this might be of interest, but - in the weeks before the crash, the iMac was very slow at times, and that seemed to be due to Firefox (way too many tabs in way too many windows...) (but more than 300 GB of the 1 TB of the HD is free...) - the crash occurred while being on an olmypus (camera) site in Firefox which was trying to show or install something (if I remember correctly...) - to me, the iMac seems to be heating up quite a lot; not sure whether that has always been the case or has started only in the weeks (or so?) before the crash, and that is still the case (but I don't know how warm / hot that iMac 2012 model shall / may be during operation. [/QUOTE]

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