The important thing is to know how the unit behaved before the P/S upgrade. If there were problems then it was imperative to have found them first. Upgrading capacitors is very straight forward. It does not affect performance unless a cap is in backwards! By indicating a changed fuse and it blowing tells me there was something else going on. I would also not change wiring on boards. What is the S/N of your unit? Have you removed all the sound cards and tried measuring voltages at the P/S M-B connector? I have attached my chart of wire colors and voltage readings for that plug. I use paper clips to push into the connector but very carefully so they don't short.