It stays with the two LEDs on…which is about what it would do, probably, if it were waiting for me to enter the decryption password, right?
I never really hear fans until whatever system I am on revs them up (I am hard of hearing), so my not hearing them in this case isn’t an indication.
I’m going to pursue the “bad display” theory for now; at least it’s something I know I can test once I get to a monitor with an HDMI input.