Alright. Problem 1 solved.. Corrupt SD card. Go figure.... Next problem is what command to use? Its not /start x or root or boot.
You're not making a Raspberry Pi that runs a miner, you're forgetting its a Pi and running a miner. That means there probably is no front end if you plug it into a monitor. If you've got to this stage then you can refollow the instructions in the OP of this guide to connect to it and start mining.