General Computer Questions

If I have a budget of $500 to build my own computer, what do you recommend to buy?

I have an ancient electronics board that I would like to use for an art project; is there a way to discharge all of the capacitors besides one at a time?

in my laptop my vlc media player audio is not coming?even i installed the new vlc player. what can i do?

with my computer and speakers off i can still hear a radio station playing faintly. how is this so?