Cubase 7.5 reinstall - can't get output sound

I have had to reinstall Cubase 7.5 on my Microsoft Surface Laptop 3. 64-bit and 16GB RAM.
(I have used Cubase for over 10 years so I mostly know my way round) but I can’t get the stereo output (or any) to come out of the internal speakers. The wave form and the output monitor show/move.

I can record with the internal mic of the laptop.

I have checked that the internal speakers work for other things (eg. YouTube, Vegas Pro etc, Media Player).

Is there anything else I might check?