STM32H747I-DISCO - how to connect to PC, how to flash?

[HTD]

I connect the CN2 to the USB3 port of my PC. The boards powers up, the LD8 is on. The pre-loaded demo starts. However - the PC doesn't detect the board. Cube Programmer doesn't see the board. Of course TouchGFXDesigner doesn't detect the board too. I tried connecting it with 3 different cables, to all my PC USB ports, also connecting more than 1 USB cable at a time. Nothing works, PC doesn't even beep after connecting the board. When I connect my other STM board (L746RG) it beeps and Cube Programmer sees it.

[Tesla DeLorean]

Make sure you use a viable cable. Charger cables with only the supply wires won't work for data connectivity to the ST-LINK. The ST-LINK/V3 likely connects at higher speeds. USB-HS (480-mbps) vs USB-FS (12-mbps), so quality shielded cables would be desirable.

Check JP6 is set to STLK

[HTD]

You were right. I tried several cables, 4 cables didn't work, 5-th cable worked. Thanks!