A1342 New SSD. Flashing folder icon on start up, no key commands working

I’ve just fitted my MacBook A1342 with a 850 Evo SSD. The recovery mode keys and others will not work. I have managed to rest the PRAM, and on start up - pressing the Option key gives me a cursor but nothing else.

What is possibly going wrong? I have a macOS bootable USB drive, but can't get into recovery mode.

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