ok we're getting some kinda luvin now. White screen then flips green and stays...
This is a chip RAM problem (usually). Try re-seating the chip RAM simm. May be that simple. It may seem like a big job, but I would take all of the cards out, clean the connections and re-install. Same with SIMMs and any socketed chips.
Hope it comes to life for you. I'd bet there's a good chance though...
