#1
Alright I'm having this problem with my guitar string and I think it has something to do with resonance .
When I struck a string (Especially high E , B and G) one or two other strings start to vibrate by their own and of course the pickups took all that result in a very unwanted noise in background.
Is this has something to do with my recent new strings set? I stringed the guitar with Elixir Nanoweb Light gauss with exceptional of Low E string from my old strings (I think it's 0.50 or something... Elixir Light has 0.46 low E)
#2
It might be ur bridge. If something in that is loose, then its gonna vibrate like crazy, especially in a hardtail/trem bridge. I think a saddle might be loose. What kind of guitar do u have??