R
check to see if any of the capacitors (The barrel looking things) have bulged
check to see if any of the capacitors (The barrel looking things) have
bulged or leaked. Those green colored capacitors look awfully familiar
to the ones that have had so much trouble in the past. Seeing as that
you hadnt booted the computer in years, they may have drie out and were
damaged when powered on.
See here
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.pcstats.com/articleview.cfm?articleID=195
http://farm1.static.flickr.com/42/120329818_0e20370795_m.jpg
http://www.electronicrepairguide.com/slightbulged.jpg