Nevarna said: it disappeared after touching the stings or anything metal on the guitar
if that's the case, then it is completely normal and there is nothing wrong with the grounding. the strings are connected to the grounding on the guitar. and the guitar is grounded through your body when you touch it. that's how the grounding on all electric guitars is supposed to work.
it always amazes me how often this question gets asked. these threads have all been the same question. some have been rightly told it's normal, and some have been lead (unintentionally, i might add) up the proverbial garden path by people who clearly don't know any better. it should really be put in the FAQ, and probably will be
http://www.jag-stang.com/forum/viewtopic.php?t=14070
http://www.jag-stang.com/forum/viewtopic.php?t=13739
http://www.jag-stang.com/forum/viewtopic.php?t=9816
http://www.jag-stang.com/forum/viewtopic.php?t=11328
http://www.jag-stang.com/forum/viewtopic.php?t=11136
http://www.jag-stang.com/forum/viewtopi ... ing#192911