Link.
Now.
Or did you just manually replace everything?
I'm temporarily using some crappy sound packaging system demo, tomorrow my project will be to take the sounds either from the internet or from my Portal files (if that's possible) and clip and set them to my liking. The person who did the sound pack made some dumb decisions on what sound goes where.
A handful are good though, to give you some ideas, I liked portal opening and closing sounds for maximizing and minimizing windows, "Hello, and, again, welcome to the Aperture Science Computer-Aided Enrichment Center" (GLaDOS) for turn-on, "Sorry, we're closed" (Turret) as failed device connection, "Shutting down..." (Turret) for shut down, "Unknown error" (Turret) for errors, "Can I help you?" (Turret) for "question", and "All deleted" (GLaDOS) for Recycle Bin emptying.
Stand by: "Are you coming back?"
USB Plugged: "OOoo what's in here?"
USB Unplugged: "Where are you taking that thing?"
These are good ideas and I'll definitely consider them.