I have an Amiga 590 hard drive, but the power supply appears to be dead on it so I want to take a look inside. I have removed three screws from the underside but it still won't open, acting like there's a screw in the top righthand corner (as you look at it from underneath).

Am I missing something obvious?

I have an Amiga 590 hard drive, but the power supply appears to be dead on it so I want to take a look inside. I have removed three screws from the underside but it still won't open, acting like there's a screw in the top righthand corner (as you look at it from underneath).

Am I missing something obvious? It looks like this underneath