Ender 3S1 Pro

Hi there.

A while ago I had an Ender 3 S1 Pro that I had installed Klipper on, running on a Rasberry Pi B3+.

However , since then , I have not been able to get it running , the software seems to be running , but the PI doesn’t communicate with the printer.

Can anyone help me troubleshoot this , I’m unsure where to even start.

I’ve reinstalled Klipper (I had a spare copy of the firmware on a card), and I’ve tried various USB cables