Macbook Pro unable to reinstall from Time Machine
The reinstallation was hung with following message:
Preparing to restore "Machintosh HD"...
After a few hours, still the same. Hard reboot later found that no modification in old OS, even requested erasing the disk.
Actions taken
Formatted disk before retry, got same issue.
Possible issue
The possible issue could be that the Mac can not reach Time Machine backup, because there is no blinking of the backup USB disk.
Solution
Install fresh OS, then start performing OS transfer from Time Machine backup.