the globes look fine
and whats the reverse start switch
It's a switch on the side of the transmission.
It's main job is to tell the car what gear it's in, So it won't allow you to start it in gear ect.
It also tell's the car when you select reverse, It then activates the light's.
This is the main accessory for the reverse light's
If you're globe's are ok, Then i'd say this is you're problem.
Before you buy another one, Just make sure the plug that plug's into it is all ok and making proper connection.