white screen on log-in of Suse 8.2

Hi, I have been visited by an unwelcome white screen at, what I estimate is the log-in window. I tried to simulate log-in by entering the info but that didn't work. Sometimes, it takes a few reboots [from the computer's reset button] before the normal log-in window appears. Things are normal thereafter! It occurred to me that I had changed to a wireless logitech mouse/keyboard so I redefined/selected a mouse PS2 there is no selection for a logitech brand of wireless mouse. That approach did not solve the problem. I'm stumped and was wondering if anybody has had this problem and had resolved it. Any and all ideas welcome thanks -- Cheers, Serge Naggar Consulting