Sorry, I am no IT geek, just someone that uses a PC for everyday purposes. When you say power down, this means I total shut down and do not go into hibernate mode. How much power is being consumed by the PC should it be left on, as it takes ages to power up.
it doesnt matter but shutting down and starting up constantly can put wear on Hard drives if it is your boot drive. i generally shutdown or restart about every 3-5 days other wise i use sleep mode