Hi, I need help,

I have a Canon A40 which seems to have got stuck in remote capture mode
after being connected to the computer. Everything works except the buttons
on the back. Can't use the menu or screen but can take pictures using the
viewfinder
Anyone have any ideas on re-setting the camera? Canon helpline just gave me
a number to ring to get a price to repair it.
Any advice would be much appreciated

Pete C