I built a computer for my sister and sent it to her. I had it and tested it for over 3 weeks and it worked great. I sent it to her and after all was hooked up she said the keyboard beeps every so often. It is the MX 3200 Laser. What could this be. I never heard anything at my place and have never heard anything like that before. She said that it seems to happen if the keyboard gets too close to the monitor. What do you think? Thanks.