Well are ur headphones new? if not then get some new 1's, if theey r then it might be ur headphone socked. try it on a different sound makin thing (electrical) lol, and see if it works.
ok this is now what happens, my speakers do the same thing, and when it is done, the front 3 speakers work but the back two do not...and there is a lag in the time it takes for the front speakers to get the noise...