Hi Cleric,
Please don't use your cpu miner (minerd) for mining. Those days are over. If you want to try mining yourself please consider purchasing a couple of Bitmain U1 Antminers. They can be plugged straight into your USB port, hash at least at around 1.6 Giga Hash per second per device at 2.5W power usage. Your cpu miner now hashes around 5 kilo hash in sCrypt (!! That should be in SHA256 and that would then be approximately 5 mega hash , DEM uses this SHA256-algorithm) at approximately 80W (@ 100% cpu utilisation). So one Antminer U1 hashes around 1000 as fast as your computer and uses only 4% of the power. Antminer U1 can be bought second hand for about 10 - 15 euro. You can (and should) use multiple.
Please note that MINERD can not be trusted and is often infected with viruses or malware. Be advised to check your system's integrity.
The correct systax should be: -a sha256d
Good luck!
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Usage: minerd [OPTIONS]
Options:
-a, --algo=ALGO specify the algorithm to use
scrypt scrypt(1024, 1, 1) (default)
sha256d SHA-256d