problem with the player or with the laptop? Answered

could you help me to solve this problem.I'm a musician and I I use a laptop .when my laptop is connected with the amplifiers ,while working  the player  stops playng for a minuit  and then goes on.I tried and changed the players ,I tried at home without amplifiers and it worked fine.what may be the reoson?what do you think?soundcard or what?please help me....