Sometimes when u load an object it is incredibly small and needs to be scaled up. Be aware though that scaling an object without moving the camera may make the object so big that it envelopes the camera (in this case the object will not be seen because backfaces will not be drawn unless specifically set).
Normally, if 'autocam' is on and you load an object DarkBasic will snap the camera to the object so that it fits nicely in the viewport.
Try this program, substituting "???.x" with your .x or .3ds object, making sure to include the correct file path.
cls
autocam on
load object "???.x",1
wait key