davecrosby 0 Newbie Poster

Hi, here's my problem.
I can press F8 to enter the safe mode options menu, but when selecting enter Safe Mode (any variant) I am briefly taken to my user selection screen for a few seconds then the computer restarts. Used to be ok, quite a new problem. Not a major issue at the moment but could be a problem in the future. Any ideas?
Thank you.
Dave Crosby