He knew, he definitly knew, I mean what are the chances it shorted out when the system wasn't on? I'll tell you what I think happened1)He was driving, bumping your shit
2) System took a shit
3) He drove home thinking about whether or not to tell you
4) He knew you would be pissed and probably bug out on him, so he didn't tell you in the hopes that you wouldn't put 2+2 together, that you would just think that it was something you did
Picture it in your head, does that seem like something your brother would do??
P.S. Younger brother? If so fvck him up, younger brothers always fvck shit up.