Restore unbootable in Windows 8.1

Backups regularly made in Acronis 2014 on Dell XPS 8700 with Windows 8.1. Have restored successfully in the past from this configuration, but it has been a while. Using UEFI/GPT. Backups made to external USB disk.
Since Windows Update on Tuesday, the computer has had no sound. Sound card driver was included in update installed on March 31. Attempted to rollback driver in Windows. Still no sound. Decide to roll back to Acronis image from March 29.
Boot from Acronis rescue disk. Do full disk restore. Get screen seen at https://imgur.com/PvlV6X4 Enter does nothing. F8 does nothing. Esc takes me to BIOS setup. Change from UEFI to "Legacy" and reboot. System still will not start. Get same screen.
Re-reading https://www.acronis.com/en-gb/support/documentation/ATIH2014/index.html… and https://www.acronis.com/en-gb/support/documentation/ATIH2014/index.html… it seems to me that since I have UEFI backup and I booted system and restored while in UEFI mode that it should boot.
I have successfully done this before, so I'm missing some step apparently. I am currently booted in "Legacy" mode and am restoring to see if that works. Any suggestions?

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Hi Les,
The next step after a driver rollback should have likely been a system restore (for next time) :)
If none of the keyboard options, Enter, F8 work... I would try the following.
Disable UEFI/Secure boot as you have done and attempt to restore your disk. Re-enable UEFI when finished. Barring that, there might be something wrong with the back up you are restoring from. While the image may be good, recent changes to the drives formatting as a result of the failed re-image might be contributing to your issue. Using a Windows Recovery Drive (USB) and using the Recovery Options would be the next thing I would try.
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Sorry, I meant to say that I attempted a system restore after trying to roll back the driver. It did not help. Still no sound.
Yes, the steps were to disable UEFI, restore disk from backup, re-enable UEFI. I tried to post yesterday, but the spam thing kept me from posting. Anyway, back and running again from the last backup before the driver update, and sound is back.
I have disabled all backups and will recreate new chains, eventually deleting the old chains.
Thanks
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Wonderful and thank you for following up.
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