Hi,
Did I just done something wrong somewhere? Did I just witness my A4000 died(In denial)! Is there any hope for it? I felt the whole world came down on me! I hope you guys can tell me what to do after! Any suggestions would be really be helpful!! 
I think we need a little more info on your A4000 set up.
What revision mainboard? Battery leaking?
Yellow screen is often chipram, in a 4000 this is a simm module. Try reseating, see if it helps. The machine now just giving you a black screen can mean the A3640 is not seated properly, you were actually better off when you still had yellow. Does the power led go from dimmed to bright?
