is other game working fine for you?
Yes, I've tested Resident Evil Rebirth and Super Smash Bross Melee, the problem only happens with Harvest Moon.
uhm, harvest moon magicial melody? it requires no special config to run this game :/
But the only thing I get is the sound and a white screen. Could it be a issue with my GPU (GeForce 9800gtx)?
what do you set on your config? probably you may just list it
try the latest nvidia driver installation. it should fix your above problem.
Like I said, my driver is updated to the latest one
Not sure if it will help, but try turning off VSync and lower that goddamn resolution to 640x480 if tou want to keep the ratio at 4:3
funny, then how about your nvidia control panel. try to use default configuration to run.