mikecosta 0 Newbie Poster

Using my pc as normal.Shut it down as normal(no problems),when,an hour or two later I turned it on,BIG problems!It starts ok and will get through POST,but then the screen stays blank and disk activity stops.The only other thing of note is that the numlock light sticks on.Does this mean the system has locked up?I would be eternally greatful for any suggestions.