Hi @KarlY,
Let me first welcome you to the Community :)
Additional hardware accessories are needed to use the board and run your applications:
– ‘USB type A to Micro-B' cable, used to connect the board (through USB connector CN5) as USB Device to host PC.
I invite you to check the hardware environments and development recommendations required to build your application around the STM32F429-Disco through this UM1662 Getting started with the STM32F429 Discovery kit.
If you still have issues, don't hesitate to come back to the Community either with new threads or as a continuity of this one (when related to same initial topic).
Imen