Checked the pins, all fine on both card reader and in the OT CF card slot. I can put my old card in and it fires up fine. So the pins are definitely ok.
Perhaps I’m missing something with the procedure.
I didn’t try anything with the card before formatting.
This is what I have done so far.
Remove old CF card from OT.
Put in card reader and copy ALL contents to a folder on computer.
Put new CF card/s (tried with both Lexar and Kingston) in CF card reader on computer and formatted for fat32 (tried both quick format and slow format).
Copied ALL contents to née CF cards.
Replaced new CF cards in OT.
Switched on. OT freezes halfway through boot.
Happens with both Lexar and Kingston CF.
I’m sure it’s not the CF cards as others have been able to use them.
I must be missing a step or maybe something else I can try.
Thanks for your help.