Hi!
I'm not sure if I understand your question, but by hitting Ctrl+ home you will only return the courser to start of the story, in text. Not on an image.
If you press Ctrl+ 0 (zero) It will adjust the image to screen.
The ruler is set "0" mark at the edge of the image and the left side of the ruler is “minus”
Have a look
here if you want to change
Other useful commands are: Ctrl +, Ctr-, Alt+scroll for zooming, the Tab key will disable all menus.
If your problems remain, then please try Tamlins remedy:
Here