mouse & keyboard trouble

I just got finish with a new install of 7.2 on a machine here at work today. The mouse an keyboard seemed to be working. then i did a yast online update . then started xwindows an the mouse an keyboard do not seem to work. so i fireup sax an they both do not seem to work there either. Not sure what the problem was is. it just seem weird that it was working before then after the yast online update it not working. i have rebooted the machine also. i'm at a lost for now. jack