Long story short I got an AT&T Atrix from a friend with an Atrix Lapdock. I'm not 100% sure of the details but he had opened the Atrix (to replace the digitizer I think) and messed up the screen to where the backlight turns on but it's always black. The digitizer still works. He wanted me to factory restore the Atrix so I did so via the Lapdock by going into settings and selecting factory restore. After it booted up again it did not boot into Webtop mode. Well great, now I'm running the phone blind.
I think I was at the "Emergency calls only" screen since clicking the bottom of the screen above the soft buttons, then towards the top, played dialtones, so I got a SIM card (out of my Sprint Touch Pro 2, just for the sake of having any SIM card in it) and rebooted with the SIM in it. I'm at a different screen now, where I can make the motor buzz by tapping the soft buttons, and if I hold the Menu (4 squares icon, leftmost soft button) it pulls up a keyboard. I believe this is the Motoblur setup screen. As stupid as it may sound, I tried entering the "123/alt/abc/e/123/alt/abc/e/b/l/u/r/o/f/f" command by eyeballing the screen, but I don't think I deactivated it since it seemed like I could still interact with this screen the same way. I tried pressing (what I felt was) 123/alt/abc on the phone, and using the Lapdock to input the letters, but that didn't seem to do anything either.
ADB is definitely not enabled, I can launch fastboot (or any of the fastboot options, such as "Fastboot" "NVFlash" "BP HW Bypass..." etc, I wrote these down and just blindly input however many Down presses to activate it).
My next plan is to print off a screenshot of the Atrix keyboard to-scale with the screen and use that as a guide to input the "bluroff" command, hopefully doing that will get the phone into a state where it can activate Webtop.
Strangely, while I was in the presumed Emergency Calls mode without a SIM, either me spazzing out on the screen or some weird luck got the Entertainment Center to appear. However I could not navigate it at all using the Lapdock, not through arrow keys or using the mouse. I've never gotten that to happen again.
If this is a failure, my main purpose in getting these from him was to use the Lapdock as a small and luggable HDMI monitor (via adapters) so I'm not too disappointed, but it would be nice to have the Atrix working as much as it did prior to factory-restoring it.