I have two 17" Apple Monitors hooked up to my G4. Lately they've been twitching slightly. It comes and goes, but it's still very distracting. Anyone have any ideas on what could be causing it? The only electrical devices next to them are a couple of external drives, a dvd burner and cable modem. The drives and burner been there for about a year, but the cable modem has been around only for about 2 months. Also, there are no speakers or cell phones around them either. Hmmm...