I switched power on and the noise was louder than i anticipated(is this normal, it was like X10 the sound of a normal PC, which i can hear through walls in my house.)
This is the part that worries me. I presume the noise is from the PSU fan suggesting it's getting too hot. It could be
a short on the mobo causing it to draw more power, unless the noise is a problem with the PSU itself.
Given it's a ready built rig it could be anything. It's probably best to return it if you can.