PS/2 port keyboard (Walthamstow, E17)

I'm trying to resurrect an old computer but I'm having trouble with a keyboard.

I have a USB keyboard that mostly works but then the PC won't recognise it and won't turn on.

There is a PS/2 port that might work better.

Do you have a PS/2 keyboard or converter to USB?

I'm trying to get this old computer working so that I can use its floppy disk drive to read an old floppy.