12 inch display wallstreet not displaying desktop correctly

I have a 12 inch screen wallstreet and the system board failed. I swamped one in i bought off ebay but when the system boots the OS9 Icon is displaced to the right and down. The screen resolution is set to 1024x768 with no other options. There’s about and inch and a half of the desktop off screen to the right and bottom. did I maybe swap in a system board looking for a 14 inch screen and its not compatible with a 12 inch display?