Mid-2011 Imac - High Sierra progress bar stuck


hi ya, imac mid-2011 won't load since tried restarting it. had upgraded 10.13.2 progress bar fills never loads.

i've tried options i've found online if have solution please let me know. shut down on christmas eve find dead christmas day! , no since dec 2016! :-(

recovery (reinstall high sierra) - loads never finishes (even usb)
safe mode fix macos sierra - shift key doesn't seem work
disk utility - finds no errors

loads , stays there , i've left 24 hours!

ideas?
 

what kind of drive inside?
 


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