Well I will get straight to the point. I have a all in one touch screen computer and there was an echo on it after my sister played loud music and i thought oh crap a blown speaker. And i was like okay i guess so when i put the earphones in it should'nt have blown the headphone speaker port there is no way so i went into settings and there was no echo affect on and i have no clue what is happening at all.

If the microphone is on, it may simply be feedback. Make sure the mic is disabled or muted and see if that helps. My system does that in such cases.