Where the holes are for the screws,you will need to remove that side panel about 990 mm x 450 mm
You will find a small plate drilled,to accept the hinge srews has fallen down and is just inside the panel you have removed.
Get a hot glue gun and just ,glue this pre drilled plate to where it belongs ,
replace the side panel and screw your hinge back on
dr bob, March 2010