when you mean light...
was it like that light on motherboards showing there is power...usually green in color.
or do you mean light, as in a "spark" light??...
cause if its a "spark" light...then you are probably looking at a larger problem, aka the 24 pin adapter on ur motherboard just blew....first have a look at the board...check to see if there are any signs of burned areas or melted plastic...usually a good start...then when you get your new psu...plug it in and see if she powers up
Desktop - DualBoot: Fedora 15/Windows 7 64bit
Netbook - Windows 7 Professional
League of Legends and Gaming Community