My scroll lock status light goes on and off without my permission! it goes on for some seconds,(e.g. 10 sec) then goes off for some other seconds and it repeats all the time. The period lengths do not seem to follow any pattern. I even can not verify if it follows my scroll lock pressing button whey I try to turn it on or off. can anyone tell me what it means?

 

by the way I am using a Dell Latitude D500 notebook and my keyboard seem to work very well. I also may add that recently I have had some problems with my memory, so now I only use one of my memory modules (256MB). But the scroll Lock status light problem started before the problem with my RAM.