Password box has the jitters so password cannot be entered

  gordonbennett 11:09 04 May 2013
Locked

When trying to get into Windows 8 the box for entering the password is very jittery and will not allow typing. A mouse click stabilises it until I try again when the box becomes jittery again. The jitters extend to the small icons of the clock face to the left and the 'off' icon to the right.

Is there a remedy and, if there is, what is it - bearing in mind particularly that I cannot get into Windows in order to input, or reset, anything.

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