The Medway Handyman wrote:

[******** why is backspace next to return?]

My screen only has two small speakers built in, each about 7 x 3 cm. Is
that the likely cause

Not really, assuming you have a separate speaker connection from the
PC/laptop to the screen?

or can I turn up the volume in some way?

If you single click the speaker icon on the bottom right of the taskbar
you'll get an overall volume control, if you double click it you'll get
several more individual volume controls.