I upgraded a Mac in my lab (23" iMac) to Lion. My MacBook Pro (mid 2007) is running Mountain Lion. For some reason the iMac is showing a different user password screen than my MBP - I can't figure out why. I like the new screen, and am trying to figure out why my MPB doesn't use it.
My MBP shows the "old" screen, with text boxes for user name and password, like this:

This screen hasn't changed on my MBP since Tiger at least.
The iMac shows only the user icon and a spot for password, like this:

I have a hard time thinking it's a hardware limitation issue. Could also be from some old setting, but the iMac used to use the old dialog too. (iMac originally ran Leopard, was upgraded to SL some time ago; same basic upgrade path as my MBP). Any ideas?
