FIFA 2008 Widescreen Issue

hi friends,

i got problem to play fifa 2008.....my preferred resolution 1440 x 900

when i start the game, my monitor turn off to power save mode...

how can i change resolution externally such as on hack the FIFA 07 using hex editor......?

anyone can suggest me....

my system : windows vista
vga card : ati radeon x1550
monitor : lg 194wt

thanks