Originally Posted by: SuperhumanPhotons from the screen of a regular monitor (not TFT screen) cause major hum and interference on electric guitars....

Not bloody likely! Photons are the minimum quanta of light, used by theoretical physicists to explain why light sometimes behaves like it's made up of particles.

I run a test lab that assesses electronic equipment for the level of interference it causes, or that it can tolerate. Photon emission does [u]not[/u] cause hum! The electrical and magnetic noise generated by monitors and fluorescent tubes can definitely create havoc, but the light is no problem at all.