i have the same problem, but i've just checked all the jacks, everything is in the right place, it's all in firmly and i still get no sound, yet when i used it a couple of weeks ago, it was fine :\ i'm trying to play ff7 on my tv due to the bigger display and i didn't even have the key tone in the main psp menu. any help would be much appreciated

edit: i feel like a total idiot now, i forgot there were two audio inputs on my tv, one for component and the other for vga/pc *facepalm*