Is it the guitar or amp thats screwed up?

you'll definately find it's the cord. i know it sounds more likely to be amp but trust me it's always the cord. i've got a marshal 150 stack and i've knocked it over after gigs, it's eve fallen off at high speeds and not a single valve is broken. IT'S THE CORD!!!!!, rusty pickups could be upgraded for like 15 bucks you stinge! but nah, if you unscrew end of lead and try forcing socket into jacket u'll get the buzz....i got a brand new cord last week for a gig, ****** thing broken already grrrrr. good luck man, rock rock on.