He doesn't have an external monitor to see if anything is appearing there. Pressing the power key never produces the customary shutdown-option dialog box. He shuts down by pressing and holding the power key until power goes off. The cursor is still visible and moves, but he can't see any GUI on the screen. He types those in, and his desktop briefly flashes onto the screen, and then the screen goes black. When he starts his MBP, instead of user icon and password field, he's prompted for both a user name and a password. He can does this many times over the course of several weeks, and then the problem strikes. He set is password to blank, so he usually just types return to finish entering his password, and he is logged in.
HIs login preferences are set to show his round icon and user name with the password field at startup. He is the only user defined and is thus an admin user.
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