I was in class, and noticed a slight ringing in my ear. However, it was very high pitched (almost that kind certain cell phones have where young poeple can hear it, and oldies can't. Well Im thinking what the heck is this..and for 40 minutes I heard it. Funny thing was is that it would randomly stop ringin...then ring again. Im like ok what the heck. When it stops again I notice the teacher was standing in the same area as when the ringing stopped earlier. So I lined me and him up to see why..and the computer processer...and some plugs in the wall for the smart board were on the other end. So there was some weird frequency pitch i would hear...but it would stop when the teacher stands in front of me to the computer? What was it??