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<blockquote data-quote="Rod" data-source="post: 1833054" data-attributes="member: 204485">Okay, let me get this straight;You have a Mac that is not yours that will not boot up from its internal HDD.You have replaced the hard drive with a Crucial MX500 SSD which did not work until your formatted it.&nbsp; How did you format it and what did you format it as?&nbsp; Did you set it as GUID disk mapping?You say you used TransMac to create what?&nbsp; A Disk Image or a DVD?You mention an El Capitan disk but there are no commercial El Capitan DVD's.&nbsp; If you made that don't forget that an Operating System is not an installer.Time Machine as stated will allow you to boot into Recovery but that only allows you to repair, erase, format and map the drive.You cannot use Reinstall MacOS because the SSD has never had a macOS on it.So to boil all that down, at the risk of repeating myself, you need an installer. You can create one easily on another Mac but not a PC.&nbsp; You can buy one online from eBay or similar or just take it to an Apple repairer who will like many of us have a range of macOS installers on a thumb drive or EHD.</blockquote>

[QUOTE="Rod, post: 1833054, member: 204485"] Okay, let me get this straight; You have a Mac that is not yours that will not boot up from its internal HDD. You have replaced the hard drive with a Crucial MX500 SSD which did not work until your formatted it. How did you format it and what did you format it as? Did you set it as GUID disk mapping? You say you used TransMac to create what? A Disk Image or a DVD? You mention an El Capitan disk but there are no commercial El Capitan DVD's. If you made that don't forget that an Operating System is not an installer. Time Machine as stated will allow you to boot into Recovery but that only allows you to repair, erase, format and map the drive. You cannot use Reinstall MacOS because the SSD has never had a macOS on it. So to boil all that down, at the risk of repeating myself, you need an installer. You can create one easily on another Mac but not a PC. You can buy one online from eBay or similar or just take it to an Apple repairer who will like many of us have a range of macOS installers on a thumb drive or EHD. [/QUOTE]

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