James,
I'm suspecting either the display driver isn't activating, or somehow this device is not sending any info to the display while remotely connected. It's kind of hard to say if we still can't see what's going on in the background due to the black screen.
If you want to give us a call, we can create a simultaneous connection to this machine, and then have you remotely access the Unattended install, where we will see how the PC reacts through the separate G2A feed.
Ash is a member of the LastPass Community Care Team.
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