Paula

This is what happened... I was admiring how loud my sons cab was when he played his bass and I wanted to listen to my music just as loud - so - I connected my ipod to the head (ampeg svt6 pro) and it worked for 2 seconds, then it went dead - hasn't worked since. Could someone give me a clue as to why this happened and how to fix it myself. (I've been quoted 400 bucks to repair it). I thank you in advance.