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I have the following problem:

I've been using Windows 8 PRO for a few months and everything has been OK, but starting a few days ago I can not log in. It happens when the system locks my screen after a period of inactivity.

The usual lock screen appears. Normally when I click it a text field appears where I can enter my password. However, once a day at random there is no place to enter my password and no user image. I can still move the mouse and the PC seems to not be frozen, but I can not log in.

How can I find the reason for this problem?

share|improve this question
"once a day"? You mean to say the error only occurs once every day, at random? – Karan Dec 23 '12 at 20:57
@Karan yes, it is random. – lampa Dec 23 '12 at 21:51
have you tried ctrl+alt+del ? – Shekhar Dec 24 '12 at 2:02
Check the system event log, though I'm not sure it'll help. Maybe enable remote desktop (since it's Pro, it can do that) and then use a different PC to connect to it and see if that works, once it "Locks". Finally, use something like psexec to reboot it remotely if nothing else. – Mark Allen Dec 24 '12 at 7:19

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