Failed restore from time machine and iMac doesn't boot any more
Hi,
I have a iMac (Retina 5K, 27-inch, late 2015) bought new in 2017. It had a fusion drive: a 2 TB HHD plus a 128GB SSD. It had Catalina installed.
I had a Time Machine automated backup in a USB drive.
On Nov 10 it stopped booting: the boot process kept being stuck on the Apple logo and the progress bar.
It had a call with Apple support (very reactive - thanks), and did a few tests with them. Turns out that it needed repair. I brought my iMac to an Apple authorized repair shop, which diagnosed that my HDD was faulty and changed it with a 2TB SSD, with a fresh Catalina install.
I brought the iMac back home, plug my USB Time Machine on it, and at startup asked to restore from my latest Time Machine backup.
The restore process progressed with hundred of thousand of items processed, and it left it like that during the night.
Unexpectedly, on morning the iMac screen was on Recovery mode (https://support.apple.com/en-us/HT201314). I restarted the iMac, but it failed to boot, a prohibitory symbol being displayed right at the start.
I restarted through an Internet Recovery, and using the disk util, I get this (in French, sorry):
At that point restoring from Time Machine doesn't work (no target disk available). Re-installing Mac OS from Recovery mode doesn't work (get stuck right at the beginning of the process).
There seems to be something wrong with the new disk. A hardware failure at this point seems highly unlikely. What should I do?
Thanks
iMac 27″, macOS 10.13