Hold down Command-Shift-Option-Delete.
On another thought - are you sure that the System 7.1 folder has the right enabler? In order to boot an LC475, a System 7.1 installation needs the System Enabler 065.
On another thought - are you sure that the System 7.1 folder has the right enabler? In order to boot an LC475, a System 7.1 installation needs the System Enabler 065.