I noticed on my dead PC PS units that the caps were bulging too, it is cheaper just to buy another PS then to source out all the caps and fix it (asuming nothing else blew up in the process).

My 2nd 840av is dead from bad caps (turns on but no chime), just waiting untill I feel like working on it. If left leaking long enough capacitor goo might eat into the electronics killing it (I removed the board and washed it). From my recolection there are 13 aluminum capacitors, 2 of which at 10uf 16v and the rest are 47uf 16v. The Tantalum SMT ones probably do not need replaced.